祈使句表示請求、命令、建議、邀請等，謂語動詞一律用原型，句子中通常不用主語，句末用驚嘆好或者句號，用降調(diào)。

　　★肯定句：動詞原型

　　Come here, please.

　　Go downstairs, please.

　　Stand up.

　　Sit down.

　　Be quiet.

　　Be careful.

　　祈使句中如果有喚語，一定要用逗號隔開，放在句首或者句尾：

　　Come in, Amy.

　　Sit down here, Tom.

　　Mary, give me a book please.

　　★否定：Don't+動詞原型

　　Don't come here.

　　Don't sit down.

　　Don't stand up.

　　Don't give me it.

　　let sb. do 讓某人做

　　Let me pass.

　　Let us have a rest.

　　Let's have a rest.

　　反意疑問：

　　Let's have a walk along the river, shall we?

　　Let us go out for a drink, will you?