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1.stop to do sth. 和stop doing sth.

“stop to do sth。” 表示停止做其它事情而去做“to do sth。”所表示的事情，可以将“to do sth。”理解成“stop”的目的状语;“stop doing sth。”表示不做“doing sth。”所表示的事情。

例如： “Stop talking. Let’s begin our class。” said the teacher. 老师说：“别说话了，让我们开始上课。”

We have kept doing our homework for a long time. Let’s stop to listen to music. 我们做家庭作业很长时间了，让我们停下来听听音乐。

2.forget to do sth。和forget doing sth. (remember to do sth. 和remember doing sth。)

“forget to do sth。”表示将来不要忘记做某事，谈的是未来的事情;“forget doing sth。”表示忘记过去应该做的事情。

例如： “Don’t forget to do your homework。” said the teacher before the class was over.

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。