Define uniport,symport and antiport. Do they require energy?

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Uniport,symport,and antiport are types of facilitated diffusion mediated by carrier proteins.
$1$. Uniport: In this process,a molecule moves across a membrane independent of other molecules.
$2$. Symport: In this process,two types of molecules cross the membrane simultaneously in the same direction.
$3$. Antiport: In this process,two types of molecules move in opposite directions across the membrane.
Energy requirement: These processes are types of facilitated diffusion,which is a passive transport mechanism. Therefore,they do not require energy $(ATP)$ to move molecules across the membrane.

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Why does the rate of diffusion of a substance along the concentration gradient not increase continuously,even when the concentration difference of the molecules across the membrane increases?

$P -$ Statement: Simple diffusion is a process of passive transport.
$Q -$ Reason: Passive transport does not require energy.

$A-$ In an antiport,both molecules move in opposite directions.
$R -$ In symport,only one molecule crosses the membrane in the same direction.

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