1 ...too...to... 太……而不能……

【用法】to后用动词原形，表示结果。

【例句】 The girl is too young to dress herself.这个女孩太小，不能自己穿衣服。

2 ...enough to... ……足以……

【用法】 to后用动词原形，表示结果。

【例句】 Would you be good enough to take my bag upstairs for me?你能否好心帮我把包拿到楼上？

3. so+主语+be/助动词/情态动词 ……确实如此

【例句】—It was very cold yesterday.昨天很冷。

—So it was.确实很冷。

 

1. would rather do...than do...

宁愿……，也不……

【例句】 She would rather fail than cheat in the examination.她宁愿考试不及格，也不愿作弊。

2. cannot but do... 只好做……

【用法】but后的不定式要省略to。

【例句】 We cannot but wait until Jane comes.我们只好等到简来。

3. cannot/can never...too...

再……也不为过，越……越好

【例句】 You cannot be too careful to cross the road.过马路时再怎么小心都不为过。

4. 主语+used to/would+do... 过去常常

【例句】I would go swimming in this river when I was young.我小时候常在这条河里游泳。

5. had better (not) do... 最好（不）做……

【例句】 You had better not wait for them.你最好不要等他们。

6. must have done... 一定/准是做过……

【用法】 表示对过去情况的推测，只用于肯定句中。

【例句】 She knows the story very well. She must have read the book.她对这个故事很熟悉。她一定读过这本书。

1. (not)in order (not)so as (not) +to do... 不定式作目的状语

【用法】to do, in order to do作目的状语可以位于句首，但so as to do不可以。

【例句】 In order not to be late, she cut across the fields.为了不迟到，她抄近路穿过了田野。

2. so+形容词/副词+as

too+形容词/副词

形容词/副词+enough+to do... 不定式作结果状语

【例句】 How could you be so stupid as to believe him?你怎么这么笨，竟然相信他的话?