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，可以將to do sth。理解成stop的目的狀語;stop doing sth。表示不做doing sth。所表示的事情。

　　例如： Stop talking. Lets begin our class。 said the teacher. 老師說：別說話了，讓我們開始上課。

　　We have kept doing our homework for a long time. Lets stop to listen to music. 我們做家庭作業很長時間了，讓我們停下來聽聽音樂。

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

　　forget to do sth。表示將來不要忘記做某事，談的是未來的事情;forget doing sth。表示忘記過去應該做的事情。

　　例如： Dont forget to do your homework。 said the teacher before the class was over.

　　老師在下課前說：不要忘記做家庭作業。

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

　　李明說：對不起，我忘記做家庭作業了。我今天下午交好嗎，陳老師?

　　3.have sth. done。(過去分詞)(讓別人)做某事

　　例如：I had my hair cut yesterday afternoon. 我昨天下午理了發。

　　My computer can not work now. I must have it repaired. 我的電腦有故障了，我必須讓人修好它。

　　4. 感官動詞后接不帶to的不定式或者現在分詞的區別

　　例如：see sb. do sth。看見某人(經常)做某事 和see sb. doing sth。看見某人(正在)做某事

　　I often see him do exercise in the morning. 我經常在早晨看見他鍛煉身體。

　　When I was walking in the park, I saw him drawing a picture there. 當我在公園散步的時候，我看見他正在那里畫畫。

　　5. 在主動語態中，感官動詞(see, hear, feel, watch等)和使役動詞(make, have, let等)要求接不帶to的不定式做賓語補足語，而在被動語態里，不定式要帶上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. 聽說她罵人了。