内容正文:
Unit 4 should / had better 提建议 & 祈使句
一、用 should 和 had better 提建议
> 二者后面都接动词原形,无人称、数的变化。
> 语气对比:had better(最好)> should(应该),had better语气更强,带有劝告、警示意味。
1. 肯定结构
- should + 动词原形 应该做……
> All of us should take part in this activity. 我们每个人都应该参加这项活动。
- had better(’d better) + 动词原形 最好做……;had常缩写为 ’d
> You had better water the flowers as soon as possible. 你最好尽快给花浇水。
> We’d better leave before it rains. 我们最好在下雨前离开。
2. 否定结构
- should not / shouldn’t + 动词原形 不应该做……
> He shouldn’t be late for school again. 他不该再上学迟到了。
- had better not + 动词原形 最好不要做……(⚠️not直接放在better后,不加to)
> You had better not play the piano now. 现在你最好别弹钢琴。
📌口诀:should/had better,后面动词用原形;否定shouldn’t,had better not记分明。
二、祈使句
> 用途:发出命令、提出要求、建议;主语you通常省略。
1. 肯定祈使句
动词原形开头
> Be quiet, please! 请保持安静!
> Please pass me the ball. 请把球传给我。
2. 否定祈使句
Don’t + 动词原形开头
> Don’t be late again! 不要再迟到了!
3. please 的用法(礼貌)
1. please放在句首:`Please + 动词原形…`
> Please pass me the ball.
2. please放在句末,前面加逗号隔开:`动词原形… , please.`
> Open the window, please. 请把窗户打开。
4. Let’s 提建议句型
Let’s + 动词原形 让我们……(包含听话人在内,用于提建议)
> Let’s visit Nanjing Museum first! 让我们先参观南京博物院吧!
> 拓展:Let’s的否定:Let’s not do sth. 让我们不要做某事。
配套练习题
一、用 should / had better 适当形式填空
1. You ________ (not go) out alone at night. 你晚上最好不要独自外出。
2. We ________ (follow) the school rules. 我们应该遵守校规。
3. You’d better ________ (not watch) too much TV.
4. They ________ (should / not) waste food.
二、按要求改写句子
1. You should finish your homework first.(改为否定句)
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2. You had better go there at once.(改为否定句)
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3. Open the door.(改为否定祈使句)
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4. Let’s go swimming.(改为否定句)
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三、单项选择
1. ______ noise in the library.
A. Not make B. Don’t make C. Not to make D. Don’t to make
2. You ______ better ______ too much sugar.
A. had; not eat B. had; don’t eat C. should; not to eat D. should; don’t eat
3. Let’s ______ for a walk after dinner.
A. go B. to go C. going D. goes
4. Please ______ late next time.
A. not be B. don’t be C. be not D. don’t to be
四、翻译句子
1. 你最好不要在课堂上讲话。
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2. 请不要把书带出教室。
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3. 我们应该多做运动。
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参考答案
一、填空
1. had better not go
2. should follow
3. not watch
4. should not / shouldn’t
二、句型改写
1. You shouldn’t finish your homework first.
2. You had better not go there at once.
3. Don’t open the door.
4. Let’s not go swimming.
三、单选
1.B 2.A 3.A 4.B
四、翻译
1. You had better not talk in class.
2. Please don’t take the books out of the classroom.
3. We should do more sports / exercise.
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