新概念英语第一册语法总结：祈使句

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　　祈使句表示请求、命令、建议、邀请等，谓语动词一律用原型，句子中通常不用主语，句末用惊叹好或者句号，用降调。

　　★肯定句：动词原型

　　Come here, please.

　　Go downstairs, please.

　　Stand up.

　　Sit down.

　　Be quiet.

　　Be careful.

　　祈使句中如果有唤语，一定要用逗号隔开，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+动词原型

　　Don't come here.

　　Don't sit down.

　　Don't stand up.

　　Don't give me it.

　　let sb. do 让某人做

　　Let me pass.

　　Let us have a rest.

　　Let's have a rest.

　　反意疑问：

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

　　Let us go out for a drink, will you?