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高一英语下册知识点: Unit13 Healthy eating. 健康饮食 (五)

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语法精讲 情态动词had better, should及 ought to的用法 (1)had better 最好 ①加动词原形 You’d better get some sleep. 你最好睡一会儿。 I’d better not disturb him. 我最好不打扰他了。 ②后接be doing sth. 表示最好立即做某事 I think I’d better be going.我想我最好立刻走。 ③祈使句中had省略 Better not wait for them. 最好不等他们。 ④反义疑问句用had You’d better put away your socks, hadn’t you? 你最好把你袜子收拾好,难道不行吗? You had better not follow her, had you?你最好不要跟她,不是吗? (2)should 与ought to 应该 ①ought to 的口气比should 稍重一些,更侧重于某件事

语法精讲

情态动词had better, should及 ought to的用法

(1)had better 最好

①加动词原形

You’d better get some sleep. 你最好睡一会儿。

I’d better not disturb him. 我最好不打扰他了。

②后接be doing sth. 表示最好立即做某事

I think I’d better be going.我想我最好立刻走。

③祈使句中had省略

Better not wait for them. 最好不等他们。

④反义疑问句用had

You’d better put away your socks, hadn’t you? 你最好把你袜子收拾好,难道不行吗?

You had better not follow her, had you?你最好不要跟她,不是吗?

(2)should 与ought to 应该

①ought to 的口气比should 稍重一些,更侧重于某件事责任、义务上该做的事情。should表示某件事宜于做。下列句子两个词不宜换用:

You are his father. You ought to take care of him.你是他的父亲,就应该照顾他。

We should not use too many big words in our everyday speech.

我们不应该说太多的大话在我们的日常讲话中。

②ought to 的句式变化

否定句:You ought not =(oughtn’t) to write so carelessly.你不该写得这样粗心。

疑问句:Ought we to give him a chance to try?我们该给他机会试一试?

③与完成时连用

should/ought to have done sth.本应该做……(而实际没做)

We ought to have finished our homework on time.我们本应该按时完成作业。

shouldn’t/oughtn’t to have done sth.本不应该做……(而实际做了)

They oughtn’t to have come back so late.他们本不该回来这样晚。

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