3.have sth. done。(过去分词)(让别人)做某事
例如:I had my hair cut yesterday afternoon. 我昨天下午理了发。
My computer can not work now. I must have it repaired. 我的电脑有故障了,我必须让人修好它。
4. 感官动词后接不带to的不定式或者现在分词的区别
例如:see sb. do sth。看见某人(经常)做某事 和see sb. doing sth。看见某人(正在)做某事
I often see him do exercise in the morning. 我经常在早晨看见他锻炼身体。
When I was walking in the park, I saw him drawing a picture there. 当我在公园散步的时候,我看见他正在那里画画。
5. 在主动语态中,感官动词(see, hear, feel, watch等)和使役动词(make, have, let等)要求接不带to的不定式做宾语补足语,而在被动语态里,不定式要带上to。
例如:The boss often made the workers work 10 hours a day.
The workers were made to work 10 hours a day.
She was heard to use strong language. 听说她骂人了。
6.常用的几个和不定式有关的句型:
Why not do sth? 为什么不做某事?
It takes/took sb. some time to do sth. 做某事花了某人多长时间。
It is/was +形容词+(for sb。) +to do sth. 做某事(对某人来说)怎么样。
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