Section Ⅲ　 Grammar--祈使句

语 境 自 主 领 悟 先观察原句 ①Don't bring your cellphone to school.

②Never forget each of us is the master of the earth.

③Give me a ring as soon as you get home.

④Write to me as soon as possible，will you？

⑤Let's live a low­carbon life，shall we？

⑥Let us take care of the house while you are away，will you？

⑦You，girls，clean the desks; you，boys，sweep the floor.

⑧Don't stay outside at night，will you？

⑨Do put your heart into your studies before the coming exam. 后自主感悟 1.①②句为否定祈使句，③④句为肯定祈使句。肯定祈使句以动词原形开头，否定祈使句以Don't或Never开头。

2.由⑤⑥ 句可知，Let's引导的祈使句的反意疑问句用shall we; Let us引导的祈使句的反意疑问句用will you。

3.由④⑥⑧句可知祈使句的反意疑问句通常用will you。

4.⑦⑨句中，在祈使句前可加you 或do对句子表示强调，以加强句子的语气。

　　1．祈使句的定义

　　表示命令、请求、劝告、警告或禁止的句子叫祈使句。祈使句的主语一般为you，通常省略，谓语动词使用原形，句末用感叹号或句号。

　　Be quiet，please.请安静。(请求)

　　Go and wash your hands.去洗手。(命令)

　　Watch your steps.走路小心。(劝告)

　　Look out! Danger！小心！危险！(警告)

Keep off the grass.勿践踏草坪。(禁止)