新概念英语第一册语法总结(十七)
17 祈使句：
· 第二人称：
let+其他人称代词
· 祈使句的否定，加don’t
· 反意疑问
祈使句（第二人称）
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
例， 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
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?
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