51. remember/forget to do sth 记得/忘记做某事(没有发生)

Please do remember to post a letter forme.务必记得帮我寄信。

remember/forget doing sth 记得/忘记做过某事

I remember telling you the news before.我记得曾经告诉过你这个消息。

52. see sb do sth 看见某人做某事(结果)

see sb doing sth 看见某人正在做某事(正在进行中)

be seen to do sth 做某事被看见

I saw them play football last weekend.

I saw her cleaning the classroom.

I saw him get on the bus.= He was seen to get on the bus.

53. something to eat/drink 一些吃/喝的东西(词不定式放在something等后修饰这些词)

I need something to eat. 我要一些吃的东西。

54. spend some time (in)doing sth /on sth 花费时间做某事(注意动词要用ing形式)(常考)

I spent 2 hours on homework.= I spent 2 hours in doing homework.

spend some money on sth/doing sth 买……花了多少钱

I ofen spend some money on the book. I ofen spend some money buying the book.

55. Sth is hard/difficult/easy to do . 做好某事很难/容易

The question is easy to answer.

56. stop to do sth停下来去某事(两件事)(常考)

stop doing sth 停止做某事(一件事)(常考)

stop sb (from) doing sth 阻止某人做某事(常考)

The two girls stopped to talk to me when they saw me.

The two girls stopped talking when they saw me.

I tried to stop my father from smoking,but failed.

57. take turns to do sth 轮流做……

They take turns to do the cleaning.

58. tell sb (not)to do sth 叫某人去(不要)做某事

He tell me not to swim in that lake.

59. There is no need (for sb) to do sth 对某人来说没必要做某事

There is no need for you to worry.

60. There is notime (for sb ) to do sth

have no time to do sth 没时间做某事

There is no time to think .I have no time to do morning exercises.