Change of Speech Questions in English

(C) $1$. The given sentence is in $Direct$ speech: "If you don't keep quiet,$I$ shall shoot you," he said to her in a calm voice.
$2$. The reporting verb is "said to her in a calm voice",which changes to "warned her calmly" or "told her calmly that he would..." because the sentence expresses a threat.
$3$. The tense changes from $Present$ to $Past$ ($don't$ becomes $didn't$,$shall$ becomes $would$).
$4$. Pronouns change accordingly: $I$ becomes $he$,$you$ becomes $her$.
$5$. Combining these,the correct $Indirect$ speech is: "He warned her calmly that he would shoot her if she didn't keep quiet."

(A) To convert the given $Indirect$ speech sentence "$I$ told him that he was not working hard" into $Direct$ speech:
$1$. The reporting verb "told" changes to "said to" when followed by an object.
$2$. The conjunction "that" is removed,and a comma and quotation marks are added.
$3$. The pronoun "he" in the $Indirect$ speech refers to the person being spoken to,which is "you" in $Direct$ speech.
$4$. The past continuous tense "was not working" changes back to the present continuous tense "are not working" in $Direct$ speech.
Therefore,the correct $Direct$ speech sentence is: "$I$ said to him,'You are not working hard.'"

(A) To convert the $Indirect$ speech "His father ordered him to go to his room and study" into $Direct$ speech:
$1$. The reporting verb "ordered" indicates an imperative sentence.
$2$. The pronoun "him" in $Indirect$ speech corresponds to "you" in $Direct$ speech.
$3$. The pronoun "his" in $Indirect$ speech corresponds to "your" in $Direct$ speech.
$4$. The structure of an imperative sentence in $Direct$ speech is: Reporting Verb + Object + "Imperative Verb + Object/Adverbial phrase."
$5$. Option $A$ correctly captures the essence of the command: "His father said,'Go to your room and study.'"

(C) To convert the given $Direct$ speech into $Indirect$ speech:
$1$. The reporting verb 'said to' is changed to 'requested' because the sentence expresses a request ('Please').
$2$. The conjunction 'to' is used to connect the reporting clause with the reported speech.
$3$. The pronoun 'my' (first person) changes to 'his' (third person) to agree with the subject 'He'.
$4$. The word 'Please' is omitted as the reporting verb 'requested' already conveys the sense of a request.
Therefore,the correct $Indirect$ speech is: He requested his father to increase his pocket-money.

(C) To convert the sentence from $Indirect$ to $Direct$ speech:
$1$. The reporting verb is "said",which remains "said" in $Direct$ speech.
$2$. The conjunction "that" is removed.
$3$. The pronoun "her" in $Indirect$ speech refers to the speaker's brother,so it becomes "my" in $Direct$ speech.
$4$. The tense in $Indirect$ speech is past continuous ("was getting married"),which corresponds to present continuous ("is getting married") in $Direct$ speech.
$5$. Therefore,the correct $Direct$ speech is: She said,"My brother is getting married."

(A) $1$. The given sentence is in $Direct$ speech: The boy said,"Who dare call you a thief?"
$2$. Since the sentence inside the quotation marks is an interrogative sentence starting with a 'Wh-' word,the reporting verb 'said' changes to 'enquired' or 'asked'.
$3$. The conjunction 'that' is not used in 'Wh-' questions.
$4$. The tense changes from present ('dare') to past ('dared').
$5$. The pronoun 'you' changes to 'him' (assuming the listener is male).
$6$. Therefore,the correct $Indirect$ speech is: The boy enquired who dared call him a thief.

(D) To convert the $Indirect$ speech sentence "She exclaimed with sorrow that it was a very miserable plight" into $Direct$ speech:
$1$. The reporting verb "exclaimed with sorrow" indicates an exclamatory sentence expressing grief or sadness.
$2$. The phrase "What a miserable plight it is" is the exclamatory form that corresponds to the reported clause "that it was a very miserable plight".
$3$. Therefore,the correct $Direct$ speech form is: She said,"What a miserable plight it is."

(A) To convert the sentence from $Indirect$ to $Direct$ speech:
$1$. The reporting verb is 'said',so it remains 'said' in $Direct$ speech.
$2$. The pronoun 'he' in $Indirect$ speech refers to the speaker 'Dhruv',so it becomes '$I$' in $Direct$ speech.
$3$. The tense 'was' (past tense) in $Indirect$ speech indicates that the $Direct$ speech was in the present tense ('am').
$4$. The word 'that' (demonstrative adjective) in $Indirect$ speech changes back to 'this' in $Direct$ speech.
Therefore,the correct $Direct$ speech is: Dhruv said,"$I$ am sick and tired of working for this company."

(D) To convert the given $Direct$ speech into $Indirect$ speech:
$1$. The reporting verb 'asked' remains 'asked'.
$2$. Since the question is a $Yes/No$ question,we use the conjunction 'if' or 'whether'.
$3$. The pronoun 'you' changes to '$I$' (referring to the speaker).
$4$. The tense changes from present ('are') to past ('was').
$5$. The phrase 'close behind me' is retained to maintain the meaning.
Therefore,the correct conversion is: "$A$ soft voice behind me asked if $I$ was alone."

(A) To convert the given $Direct$ speech into $Indirect$ speech:
$1$. The reporting verb 'said to' changes to 'asked' because the sentence is an interrogative sentence.
$2$. The conjunction 'that' is not used; instead,the question word 'why' acts as the connector.
$3$. The tense changes from $Present$ $Simple$ ('don't go') to $Past$ $Simple$ ('did not go').
$4$. The pronoun 'you' changes to 'he' (referring to the object 'him').
$5$. The time expression 'today' changes to 'that day'.
Therefore,the correct sentence is: 'She asked him why he did not go that day.'

(D) $1$. The given sentence is in $Indirect$ speech: "He exclaimed with joy that India had won the Sahara Cup."
$2$. The phrase "exclaimed with joy" indicates that the original sentence contained an interjection expressing joy,such as "Hurrah!"
$3$. The tense of the reported speech is in the $Past$ $Perfect$ ("had won"),which corresponds to the $Present$ $Perfect$ ("has won") in $Direct$ speech.
$4$. Therefore,the correct $Direct$ speech form is: He said,"Hurrah! India has won the Sahara Cup."

(B) $1$. The given sentence is in $Direct$ speech: "The little girl said to her mother,'Did the sun rise in the East?'"
$2$. Since the reported speech is an interrogative sentence (Yes/No question),we change the reporting verb 'said to' into 'asked'.
$3$. We use the conjunction 'if' or 'whether' to connect the reporting and reported clauses.
$4$. The tense of the reported speech changes from simple past ('did... rise') to past perfect or remains simple past depending on context,but since it is a universal truth,the tense remains simple past ('rose').
$5$. Thus,the correct $Indirect$ speech is: "The little girl asked her mother if the sun rose in the East."

(A) $1$. The given sentence is in $Direct$ speech: The man said,"No,$I$ refuse to confess guilt."
$2$. The word "No" indicates a strong refusal or denial.
$3$. When converting to $Indirect$ speech,the reporting verb "said" combined with "No" is best expressed as "emphatically refused" or "denied".
$4$. The present tense "refuse" in the direct speech changes to the past tense "refused" in the indirect speech.
$5$. Therefore,the most appropriate conversion is: "The man emphatically refused to confess guilt."

(C) The given sentence is in $Indirect$ speech: "Nita ordered her servant to bring her a cup of tea."
$1$. The reporting verb "ordered" indicates an imperative sentence,which usually changes from "said to" in $Direct$ speech.
$2$. The pronoun "her" (referring to Nita) in $Indirect$ speech changes to "me" in $Direct$ speech.
$3$. The structure "ordered her servant to" corresponds to "said to her servant" followed by the imperative command "Bring me a cup of tea."
$4$. Therefore,the correct $Direct$ speech form is: Nita said to her servant,"Bring me a cup of tea."

(A) The given sentence is in $Direct$ speech: "My cousin said,'My room-mate had snored throughout the night.'"
To convert it into $Indirect$ speech:
$1$. The reporting verb 'said' remains 'said' as there is no object.
$2$. The conjunction 'that' is used to connect the reporting and reported clauses.
$3$. The pronoun 'My' changes to 'her' (possessive pronoun).
$4$. The tense in the reported speech is 'Past Perfect' ($had$ $snored$). In $Indirect$ speech,the 'Past Perfect' tense remains unchanged.
Therefore,the correct $Indirect$ speech is: "My cousin said that her room-mate had snored throughout the night."

(C) $1$. The given sentence is in $Direct$ speech: "Please don't go away",she said.
$2$. The word "Please" indicates a request or a plea. Therefore,the reporting verb "said" should be changed to "begged" or "requested".
$3$. In $Indirect$ speech,the imperative sentence "don't go away" is converted using the infinitive form "not to go away".
$4$. Combining these,the sentence becomes: "She begged me not to go away."
$5$. Thus,option $C$ is the correct conversion.

(B) To convert the given direct speech into indirect speech,follow these steps:
$1$. The reporting verb 'said to' changes to 'told'.
$2$. The conjunction 'that' is used to connect the reporting and reported clauses.
$3$. The pronoun '$I$' changes to 'she' according to the subject of the reporting verb.
$4$. The tense changes from present simple ('know') to past simple ('knew').
$5$. In indirect speech,the word order in the subordinate clause changes from interrogative structure ('where is everyone') to assertive structure ('where everyone was').
Therefore,the correct sentence is: 'She told her friend that she knew where everyone was.'

(B) To convert the given sentence from $Direct$ speech to $Indirect$ speech:
$1$. The reporting verb is '$said$',which is in the past tense,so the tense of the reported speech will change.
$2$. The pronoun '$We$' changes to '$they$' to match the subject of the reporting verb.
$3$. The present perfect tense '$have lived$' changes to the past perfect tense '$had lived$'.
$4$. The conjunction '$that$' is used to connect the reporting clause and the reported clause.
Therefore,the correct sentence is: 'They said that they had lived in this city for many years.'

(B) The given sentence is in $Indirect$ speech: "The teacher told Maria that she was not working hard."
To convert it into $Direct$ speech:
$1$. The reporting verb 'told' changes to 'said to'.
$2$. The conjunction 'that' is removed,and a comma and quotation marks are added.
$3$. The pronoun 'she' changes to 'you' because the teacher is addressing Maria directly.
$4$. The past tense 'was not working' changes to the present tense 'are not working' to match the reporting verb 'said'.
Thus,the correct $Direct$ speech is: The teacher said to Maria,"You are not working hard."

(A) $1$. The given sentence is in $Indirect$ speech: "Her mother ordered her to go to the kitchen and cook food."
$2$. The reporting verb is "ordered",which indicates an imperative sentence.
$3$. In $Direct$ speech,the reporting verb "ordered" is typically converted to "said to" or simply "said" when addressing someone.
$4$. Option $A$ is the most grammatically correct conversion: "Her mother said,'Go to the kitchen and cook food.'"
$5$. Option $B$ is incorrect because "said her" is grammatically wrong; it should be "said to her".
$6$. Option $C$ uses "tells",which is incorrect for past tense reporting.
$7$. Option $D$ uses "asked",which is generally used for interrogative sentences,not commands.

(D) $1$. The given sentence is in $Indirect$ speech: "He said that his sister was getting married."
$2$. To convert it into $Direct$ speech,we identify the reporting verb "said" and the reported speech "his sister was getting married."
$3$. The pronoun "his" in $Indirect$ speech refers to the speaker's sister,which becomes "my" in $Direct$ speech.
$4$. The tense "was getting married" (Past Continuous) in $Indirect$ speech corresponds to "is getting married" (Present Continuous) in $Direct$ speech.
$5$. Therefore,the correct $Direct$ speech form is: He said,"My sister is getting married."

(C) To convert the given $Direct$ speech into $Indirect$ speech:
$1$. The reporting verb 'said' is changed to 'asked' or 'enquired' because the sentence is an interrogative sentence.
$2$. Since the question starts with a 'Wh-' word ('Who'),no conjunction like 'that' or 'if' is used; the 'Wh-' word itself acts as the connector.
$3$. The tense changes from present ('dare') to past ('dared').
$4$. The pronoun 'you' changes to 'her' (assuming the listener is female).
$5$. The sentence structure changes from interrogative to assertive.
Therefore,the correct conversion is: The mother enquired who dared call her a cheater.

(D) To convert the given $Indirect$ speech sentence into $Direct$ speech:
$1$. The reporting verb is 'said',so the tense of the reported speech in $Direct$ form will be present tense.
$2$. The pronoun 'she' in $Indirect$ speech refers to the speaker 'Diana',so it changes to '$I$' in $Direct$ speech.
$3$. The verb 'was' (past tense) changes to 'am' (present tense) in $Direct$ speech.
$4$. The demonstrative 'that' changes to 'this' in $Direct$ speech.
Therefore,the correct $Direct$ speech is: Diana said,"$I$ am sick and tired of this job."

(A) To convert the given $Direct$ speech into $Indirect$ speech:
$1$. The reporting verb 'asked' remains the same.
$2$. Since the question is a $Yes/No$ question,we use the conjunction 'if' or 'whether'.
$3$. The pronoun 'you' changes to '$I$' (referring to the speaker).
$4$. The tense changes from present ('Are') to past ('was').
$5$. The phrase 'my son' is omitted or can be implied as a term of address,but the core structure is '$A$ soft voice close behind me asked if $I$ was sad'.

(B) $1$. The given sentence is in $Direct$ speech: "He said to her,'Why don't you work today?'"
$2$. Since it is an interrogative sentence starting with a 'wh-word' ('Why'),the reporting verb 'said to' changes to 'asked'.
$3$. The conjunction used is the 'wh-word' itself ('why').
$4$. The tense changes from $Present$ $Simple$ ('don't work') to $Past$ $Simple$ ('did not work').
$5$. The time expression 'today' changes to 'that day'.
$6$. Thus,the correct $Indirect$ speech is: 'He asked her why she did not work that day.'

(B) The given sentence is in $Indirect$ speech: "Ram exclaimed with joy that India had won the World Cup."
$1$. The phrase "exclaimed with joy" indicates that the original $Direct$ speech used an interjection like "Hurrah!" to express happiness.
$2$. The tense in the $Indirect$ speech is "had won" (Past Perfect),which corresponds to the "Present Perfect" tense ("has won") in the $Direct$ speech.
$3$. Therefore,the correct $Direct$ speech is: Ram said,"Hurrah! India has won the World Cup."

(A) $1$. The given sentence is in $Direct$ speech: "The little boy said to her father,'Did the sun rise in the East?'"
$2$. Since the sentence is an interrogative sentence (Yes/No type),the reporting verb 'said to' changes to 'asked'.
$3$. The conjunction 'if' or 'whether' is used to join the reporting and reported speech.
$4$. The reported speech 'Did the sun rise in the East?' is a universal truth. In cases of universal truths,the tense of the reported speech does not change even if the reporting verb is in the past tense.
$5$. Therefore,the tense remains in the simple past or simple present depending on the context of the universal fact. However,standard grammar rules for universal truths often retain the original tense or shift to simple past. Given the options,'The little boy asked her father if the sun rose in the East' is the most grammatically appropriate conversion.

(C) To convert an $Indirect$ speech sentence into $Direct$ speech,we follow these rules:
$1$. The reporting verb 'ordered' indicates an imperative sentence,which is usually introduced by 'said to' in $Direct$ speech.
$2$. The pronoun 'him' in $Indirect$ speech refers to the subject 'Rex',which becomes 'me' in $Direct$ speech.
$3$. The structure 'Rex ordered his servant to...' becomes 'Rex said to his servant,"..."'.
Therefore,the correct $Direct$ speech form is: Rex said to his servant,"Bring me a cup of coffee."

(D) In $Direct$ speech,the sentence is: "Please don't run away",He said.
To convert this into $Indirect$ speech:
$1$. The reporting verb "said" is changed to "begged" because the speaker is making a request using "Please".
$2$. The imperative sentence "don't run away" is converted into an infinitive phrase using "not to run away".
$3$. The structure becomes: He + begged + (object) + not to + verb.
Therefore,the correct $Indirect$ speech is: "He begged me not to run away."

(A) To convert the given direct speech into indirect speech:
$1$. The reporting verb is 'said' (past tense),so the tense inside the reported speech will change.
$2$. The pronoun '$I$' changes to 'he' to match the subject 'Soldier'.
$3$. The modal verb 'must' often changes to 'had to' or remains 'must' depending on the context of obligation. However,in standard grammar exercises,'must' indicating a present obligation in the past is often converted to 'had to'.
$4$. Looking at the options,option $A$ retains 'must'. In many contexts,'must' is used to express a strong obligation that persists,and it is acceptable to keep it as 'must' in indirect speech if the obligation is still valid. Therefore,'Soldier said that he must follow the instructions' is the most appropriate transformation.

(B) $1$. The given sentence is in $Direct$ speech: "The teacher said to the boy,'Did you break the chair?'"
$2$. Since the sentence is an interrogative sentence starting with an auxiliary verb,we use 'asked' instead of 'said to'.
$3$. We use the conjunction 'if' or 'whether' to connect the reporting and reported speech.
$4$. The tense of the reported speech changes from $Simple$ $Past$ ("Did you break") to $Past$ $Perfect$ ("had broken").
$5$. The pronoun 'you' changes to 'he' (referring to the boy).
$6$. Therefore,the correct $Indirect$ speech is: "The teacher asked the boy if he had broken the chair."

(C) To convert the given direct speech into indirect speech,follow these steps:
$1$. The reporting verb 'said' remains 'said' as there is no object.
$2$. The conjunction 'that' is used to connect the reporting and reported speech.
$3$. The pronoun '$I$' (first person) changes to 'she' (referring to Mother).
$4$. The tense 'have told' (present perfect) changes to 'had told' (past perfect) because the reporting verb is in the past tense.
$5$. The pronoun 'you' (second person) changes to 'me' (assuming the mother is speaking to the narrator).
$6$. Therefore,the correct indirect speech is: Mother said that she had often told me to wake up early in the morning.

(B) To convert the given direct speech into indirect speech:
$1$. The reporting verb 'said to' changes to 'asked' because the sentence is an interrogative sentence.
$2$. Since the question starts with a helping verb ('Will'),we use 'if' or 'whether' as a conjunction.
$3$. The tense changes from future simple ('will') to conditional ('would').
$4$. The pronoun 'you' changes to 'she' based on the object 'her'.
$5$. The sentence structure changes from interrogative to assertive: '$I$ asked her whether she would watch the new movie.'

(A) To convert the given $Direct$ speech into $Indirect$ speech:
$1$. The reporting verb 'said' changes to 'asked' because the sentence is an interrogative sentence.
$2$. Since the question starts with an auxiliary verb ('Have'),we use the conjunction 'if' or 'whether'.
$3$. The pronoun 'you' changes to '$I$' (assuming the listener is 'me').
$4$. The tense changes from Present Perfect ('Have... prepared') to Past Perfect ('had prepared').
$5$. Therefore,the correct sentence is: 'My friend asked me if $I$ had prepared well for the match.'

(A) $1$. The reporting verb is 'said to',which changes to 'told' in $Indirect$ speech.
$2$. The conjunction 'that' is used to join the reporting and reported speech.
$3$. The pronoun 'you' (second person) changes according to the object of the reporting verb ('me'). Therefore,'you' changes to '$I$'.
$4$. The tense changes from $Present$ $Perfect$ ('have not submitted') to $Past$ $Perfect$ ('had not submitted').
$5$. The possessive adjective 'your' changes to 'my' to agree with the subject '$I$'.
$6$. Thus,the correct sentence is: The $HR$ told me that $I$ had not submitted my documents.

(A) To convert the given $Indirect$ speech sentence into $Direct$ speech:
$1$. The reporting verb is "said" (past tense),so the tense inside the reported speech must be adjusted accordingly.
$2$. The pronoun "it" in $Indirect$ speech refers to the "election commission" (a collective body),which is often represented as "we" when speaking on behalf of the institution.
$3$. The modal "would" in $Indirect$ speech is the past form of "shall" or "will". In $Direct$ speech,"shall" is the appropriate choice for the first person plural "we".
$4$. Therefore,the correct $Direct$ speech form is: The election commission said,"We shall re-consider the counting of voting."

(C) $1$. The given sentence is an exclamatory sentence: "Such a beautiful place it is!" said the tourist.
$2$. In $Indirect$ speech,for exclamatory sentences,the reporting verb 'said' is changed to 'exclaimed'.
$3$. The conjunction 'that' is used to connect the reporting and reported clauses.
$4$. The tense of the reported speech changes from present ('is') to past ('was') because the reporting verb is in the past tense.
$5$. Thus,the correct conversion is: The tourist exclaimed that the place was very beautiful.

(B) To convert the given direct speech into indirect speech,follow these steps:
$1$. The reporting verb is 'said',which is in the past tense,so the tense inside the quotation marks will change.
$2$. The pronoun '$I$' (first person) changes to 'he' (third person) to match the subject 'The player'.
$3$. The modal verb 'have to' changes to 'had to' because the reporting verb is in the past tense.
$4$. The conjunction 'that' is used to join the reporting clause and the reported speech.
Therefore,the correct indirect speech is: "The player said that he had to win the match."

(B) $1$. The given sentence is in $Direct$ speech: "He said to his father,'$I$ did not go to school yesterday.'"
$2$. To convert it into $Indirect$ speech:
- The reporting verb 'said to' changes to 'told'.
- The conjunction 'that' is used to join the clauses.
- The pronoun '$I$' changes to 'he' (referring to the subject).
- The tense changes from $Simple$ $Past$ ('did not go') to $Past$ $Perfect$ ('had not gone').
- The time expression 'yesterday' changes to 'the previous day'.
$3$. Combining these,we get: "He told his father that he had not gone to school the previous day."
$4$. Therefore,option $B$ is the correct answer.

(D) To convert the given direct speech into indirect speech,follow these steps:
$1$. The reporting verb 'said to' is changed to 'told' because there is an object 'me'.
$2$. The conjunction 'that' is used to connect the reporting clause and the reported speech.
$3$. The tense of the reported speech changes from present continuous ('are going on') to past continuous ('were going on') because the reporting verb is in the past tense.
$4$. Therefore,the correct indirect speech is: 'The director told me that there were auditions going on.'

(C) In $Direct$ speech,the sentence is an imperative sentence (a command or advice).
When converting an imperative sentence into $Indirect$ speech,the reporting verb 'said to' is changed to 'ordered','advised',or 'requested' depending on the tone.
Since 'Practice Trigonometry' is an instruction given by a teacher,'ordered' is the most appropriate reporting verb.
The conjunction 'to' is used to connect the reporting clause and the reported speech.
Therefore,the correct conversion is: 'The teacher ordered Jack to practice trigonometry.'

(B) To convert the given $Direct$ speech into $Indirect$ speech:
$1$. The reporting verb 'said to' is changed to 'ordered' because the sentence expresses a command.
$2$. The conjunction 'to' is used to connect the reporting clause with the reported speech.
$3$. The word 'now' in $Direct$ speech changes to 'then' in $Indirect$ speech.
$4$. Therefore,the correct sentence is: 'The police officer ordered his team to catch the criminal then.'

(C) $1$. The given sentence is in $Direct$ speech: The teacher says to the student,"Honesty is the best policy."
$2$. The reporting verb is 'says' (present tense),so the tense inside the quotation marks will not change.
$3$. 'Says to' changes to 'tells' in $Indirect$ speech.
$4$. The universal truth 'Honesty is the best policy' remains unchanged.
$5$. Therefore,the correct $Indirect$ speech is: The teacher tells the student that honesty is the best policy.

(D) $1$. The given sentence is in $Direct$ speech: The little girl said to the mother,"Why do you work so hard?"
$2$. Since it is an interrogative sentence starting with a 'wh-word',the reporting verb 'said to' changes to 'asked'.
$3$. The conjunction 'that' is not used; instead,the 'wh-word' ('why') acts as the connector.
$4$. The tense changes from $Present$ $Simple$ ('do you work') to $Past$ $Simple$ ('she worked').
$5$. The pronoun 'you' changes to 'she' to refer to the mother.
$6$. Thus,the correct $Indirect$ speech is: The little girl asked the mother why she worked so hard.

(A) To convert the given $Direct$ speech into $Indirect$ speech:
$1$. The reporting verb 'said to' is changed to 'warned' because the statement implies a threat or warning.
$2$. The conjunction 'that' is used to connect the reporting clause and the reported speech.
$3$. The pronoun 'you' changes to 'he' (referring to the thief).
$4$. The verb 'jump' changes to its past form 'jumped' due to the past tense of the reporting verb.
$5$. The pronoun '$I$' changes to 'he' (referring to the watchman).
$6$. The modal 'will' changes to 'would'.
Thus,the correct sentence is: The watchman warned the thief that he would call the police if he jumped the wall.

(B) To convert a $Direct$ speech question into $Indirect$ speech:
$1$. The reporting verb 'said' changes to 'asked'.
$2$. Since the question is a Yes/No question,we use the conjunction 'if' or 'whether'.
$3$. The tense changes from present ('is') to past ('was') because the reporting verb is in the past tense.
$4$. The word order changes from interrogative ('is it') to assertive ('it was').
Therefore,the correct conversion is: "Jack asked if it was a routine health checkup." Both $B$ and $D$ are grammatically correct,but $B$ is the most standard form.

(D) To convert the direct speech sentence "They said,'It was our mistake.'" into indirect speech:
$1$. The reporting verb 'said' remains 'said' as there is no object.
$2$. The conjunction 'that' is used to connect the reporting clause and the reported speech.
$3$. The pronoun 'our' changes to 'their' to agree with the subject 'They'.
$4$. The tense 'was' (simple past) remains 'was' (simple past) in indirect speech because it represents a state of being in the past,or it can be changed to 'had been' (past perfect). However,in standard English grammar exercises,keeping it as 'was' is often accepted when the reporting verb is in the past tense,provided the meaning remains clear.
$5$. Therefore,the most accurate conversion is: "They said that it was their mistake."