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1、begin to和begin doing-一般来说，begin to do和begin doing可以互换，但在以下三种情况下，用to do：1. 主语不是指人，而是it等。如：It began to rain.2. begin后接表示心理活动的词。如：begin to knowbelieve， wonder， think等。3. begin本身是ing形式，为避免重复后接to do即，beginning to do比较begin to do与begin doing：1）begin后跟to do或doing，含义上没有多少差异。如果谈论一个长期的习惯动作开始养成时，更加常用begin doin
2、g。例如：How old were you when you first began playing the piano?2）当begin后面跟的是understand，realize，see，know，think等动词时，用begin to do。例如：She began to think she was wrong after a second thought.经过重新考虑后，她开始认为她错了。3）当begin用于进行时态时，其后跟to do。如：Mary is beginning to do her homework.4）当主语是物或用于描述天气变化时，其后跟to do。如：The wa
3、ter began to boil. 水开始开了。It began to get dark before we knew it. 不知不觉地天黑下来了。11 begin(start) doing/to do begin / start to do sth begin / start doing sth.1)谈及一项长期活动或开始一种习惯时，使用doing. How old were you when you first started playing the piano? 你几岁时开始弹钢琴？2)begin, start用进行时时，后面动词用不定式to doI was beginning to
4、 get angry。我开始生起气来。3)在attempt, intend, begin, start 后接know, understand, realize这类动词时，常用不定式to do。 I begin to understand the truth。我开始明白真相。4)物作主语时It began to melt. 7 go on doing/to do go on to do做了一件事后，接着做另一件事。go on doing 继续做原来做的事。 After he had finished his maths，he went on to do his physics. 做完数学后，他接
5、着去做物理。 Go on doing the other exercise after you have finished this one. 作完这个练习后，接着做其他的练习 8.6 try doing/to do try to do努力，企图做某事。try doing 试验，试着做某事。You must try to be more careful.你可要多加小心。I tried gardening but didnt succeed.我试着种果木花卉，但未成功。 8.2 forget doing/to do forget to do忘记要去做某事。(未做)forget doing忘记做过
6、某事。(已做)The light in the office is stil on. He forgot to turn it off.办公室的灯还在亮着，它忘记关了。(没有做关灯的动作)He forgot turning the light off. 他忘记他已经关了灯了。 ( 已做过关灯的动作)Dont forget to come tomorrow.别忘了明天来。 (to come动作未做)典型例题- The light in the office is still on.- Oh，I forgot_. A. turning it off B. turn it off C. to turn it off D. having turned it off 答案：C。由the light is still on 可知灯亮着，即关灯的动作没有发生，因此用forget to do sth.而forget doing sth表示灯已经关上了，而自己忘记了这一事实。此处不符合题意。
