高中英语 Module 2 Traffic Jam Section Ⅲ Grammar-祈使句教学案 外研版必修4-外研版高一必修4英语教学案

Module 2 Traffic Jam Section Ⅲ Grammar-祈使句语法图解探究发现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.④Writeto 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, cleanthe desks; you, boys, sweepthe floor.⑧Don't stay outside at night, will you?⑨Do putyour heart into your studies before the coming exam.[我的发现](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 do 或 you 对句子表示强调，以加强句子的语气。一、定义表示命令、请求、建议、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.勿踏草坪。(禁止)二、形式1．肯定结构(1)Do 型(行为动词原形开头)Follow the rules of the road.遵守交通规则。有的祈使句在意思明确的情况下可省略动词。This way, please.＝Go this way, please.请这边走。(2)Be 型(系动词 be 开头)Be sure to get here before nine.一定要九点钟以前到这里。(3)Let 型(Let's/Let sb.＋动词原形)Let's have a meeting this afternoon.今天下午我们开一个会吧。Let me have a try if you don't want to.如果你不想，就让我试一试吧。2．否定结构(1)Do 型和 Be 型的否定式都是在句首加 Don't 或 Never 构成。即：Don't/Never＋动词原形Don't belate tomorrow.明天不要迟到。Never put offwhat you should do till tomorrow.今日事今日毕。(2)Let 型祈使句的否定式有两种：Don't＋let＋宾语＋动词原形(＋其他成分)；Let's not...