老师在下课前说："不要忘记做家庭作业。"

　　"I'm sorry. I forgot doing my homework. May I hand it in this afternoon, Mr. Chen?" said Li Ming.

　　李明说："对不起，我忘记做家庭作业了。我今天下午交好吗，陈老师?"

　　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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