5 cease to do cease doing
6 try to do（努力做某事） try doing（试着做某事）
7 go on to do（继续去做某事） go on doing（继续做某事） 8 afraid to do（担心做某事） afraid doing（担心正在做的事）
9 interested to do（对做某事感兴趣） interested doing（对正在做的感兴趣） 10 mean to do（打算做某事） mean doing（做某事很有意义） 11 begin/ start to do（开始去做某事） begin/ start doing（开始做某事） forget doing/to do
forget to do 忘记要去做某事。 (未做) forget doing 忘记做过某事。 (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，他忘记关了。(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) Don't forget to come tomorrow.别忘了明天来。 (to come动作未做) remember doing/to do
remember to do 记得去做某事 (未做) remember doing 记得做过某事 (已做)
Remember to go to the post office after school.记着放学后去趟邮局。 Don't you remember seeing the man before?你不记得以前见过那个人吗？ regret doing/to do
regret to do 对要做的事遗憾。 (未做) regret doing 对做过的事遗憾、后悔。 (已做)
I regret to have to do this,but I have no choice.我很遗憾必须这样去做，我实在没有办法。 I don't regret telling her what I thought.我不为告诉她我的想法而后悔。 cease doing/to do
cease to do 长时间，甚至永远停做某事。 cease doing 短时停止做某事，以后还会接着做。
That department has ceased to exist forever.那个部门已不复存在。
The girls ceased chatting for a moment when their teacher passed by.姑娘们在老师走过时，停了会聊天。 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 didn't succeed.我试着种果木花卉，但未成功。 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
be afraid doing/to do
be afraid to do 不敢，胆怯去做某事，是主观上的原因不去做，意为“怕”；
be afraid of doing 担心出现doing的状况、结果。doing 是客观上造成的，意为“生怕，恐怕”。 She was afraid to step further in grass because she was afraid of being bitten by a snake. 她生怕被蛇咬着，而不敢在草丛中再走一步。
She was afraid to wake her husband.她不敢去叫醒她丈夫。 She was afraid of waking her husband.她生怕吵醒她丈夫。 .
be interested doing/to do
interested to do 对做某事感兴趣，想了解某事。
interested in doing 对某种想法感兴趣，doing 通常为想法。
I shall be interested to know what happens.我很想知道发生了什么事。(想了解) I'm interested in working in Switzerland. Do you have any idea about that 我对在瑞士工作感兴趣。你想过这事吗? (一种想法) mean doing/to do mean to do 打算、想 mean doing 意味着
I mean to go,but my father would not allow me to.我想去，但是我父亲不肯让我去。 To raise wage means increasing purchasing power.赠加工资意味着增加购买力。 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 do I was beginning to 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.
⒉动词不定式的时态，语态 (1)时态
①一般式：动词不定式一般式表示的动作发生在谓语动词之后，有时表示同时发生.如： I hope to become a university student this year.(to become发生在hope之后) We often hear Dick play the piano in the next room.(play和hear同时发生) ②完成式：表示的动作发生在谓语动词所表示的动作之前.如： I'm sorry to have kept you waiting.
We are too young to have seen the old society. ③进行式：表示的动作与谓语动词同时发生.如：
The teacher happened to be correcting our papers when I came in. They seemed to be discussing something important. (2)语态
如果动词不定式的逻辑主语是这个不定式所表示的动作的承受者，不定式一般要用被动语态形式，如： It's a great honour to be invited to Mary's birthday party.(不定式作主语) It was impossible for lost time to be made up.(不定式作主语) I wish to be sent to work in the country.(不定式作宾语) Can you tell me which is the car to be repaired (不定式作定语) He went to the hospital to be examined.(不定式作状语)
在There be结构中，修饰主语的不定式可用被动，也可用主动，如：There are still many things to take care of (to be taken care of).但有时两种形式表达的意思不同，如：These is nothing to do now.( We have nothing to do now.) There is nothing to be done now.(We can do nothing now.)
⒊动名词的时态，语态 (1)时态
①一般式：动名词的一般式所表示的动作可以是泛指，也可与谓语动词同时发生，或发生在谓语动作之前或之后，如：
We are interested in collecting stamps.
I shall never forget seeing the Great Wall for the first time. We are not afraid of dying.
②完成式所表示的动作发生在谓语动词之前，如： Imagine having travelled on the moon.
We were praised for having finished the work ahead of time. (2)被动语态
①如果动名词的逻辑主语为动名词所表示的动作的承受者，动名词要用被动语态，动名词的被动语态有一般式与完成式之分，如：
The young man came in without being noticed.
He prided himself on having never been beaten in class. ②有些动词后的动名词用主动形式，但表示被动意义，如： The bike needs repairing.
If a thing is worth doing,it is worth doing well.
⒋在口语中，为避免重复，常用“to”代替不定式结构，有时甚至可以把to省略，如： ①-Did you go to visit the Great Wall
-No,I wanted to,but there wasn't enough time. ②-Would you like to come to a party -I'd love to.
③-Don't make any mistakes in your homework,will you -I'll try not to.
④-Try to be back by 12,won't you
-OK,I'll try.
另外，be going to,ought to,used to等也常用于这一结构中。 ⒌在why引起的问句中，省略“to”，如： Why spend such a lot of money Why not wait for a couple of days
⒍当两个或更多作用相同的不定式并列使用时，只在第一个不定式前加“to”，如： It's quite necessary for us to read more and have more practice. ⒎“to”在下列短语中是“介词”，后接动名词或名词形式，如：
devote…to,face up to(勇敢地面对),look forward to(盼望),object to(反对),take to(养成习惯，对……感兴趣；开始从事某种活动),be used to(习惯于)等。
进行式
形式
to be + 现在分词
He seems to be following us.他好像在跟着我们。 用法
①用于助动词之后
He must be coming by bus.他一定是乘公共汽车来的。
You shouldn't be reading a novel.现在你不应该看小说，你应该看课本。 ②用于appear，happen，pretend，seem之后
I happened to be standing next to him when he collapsed.相当于：
It happened that I was standing next to him when he collapsed.他倒下的时候我恰巧站在他身边。
③hope 和promise之后，或agree，arrange，decide，determine/be determined，plan，undertake之后，但用于hope和promise后更常见：
I hope/hoped to be earning my living in a year's time.相当于：
I hope I will/I hoped I would be earning……我希望在一年之内能自食其力。
被动式
不定式被动式的用法
不定式到底用主动形式还是被动形式，往往取决于句子的意思，即意思上为主动就用主动形式，意思上为被动就用被动形式：
Did it need to be done so soon? 这事需要这么快就做吗? She can’t bear to be laughed at. 她受不了被人嘲笑。 There was business to be taken care of. 有生意要人管理。
It remains to be seen whether you are right. 你是否正确，以后见分晓。 There was a lot of rubbish to be got rid of. 有大量垃圾需要扔掉。 不定式完成被动式的用法
不定式的完成被动式表示发生在谓语动作之前的被动动作：
I’m pleased to have been given this opportunity. 给了我这次机会我很高兴。