以下动词后，只能跟不定式作宾语 afford （付得起），agree（同意），aim(力求做到), appear（显得），arrange（安排），ask（要求），attempt （试图），care（想要），choose（决定），claim（声称），condescend（屈尊），consent（准许），decide（决定），demand（要求），determine（决心），endeavor（竭力），expect（期待），fail（未履行），help（帮助），hesitate（犹豫），hope（希望），learn（学会），manage（设法），neglect（疏忽），offer（主动提出），plan（计划），prepare（准备），pretend（假装），proceed（接着做），promise（答应），prove（证明），refuse（拒绝），resolve（解决），seem（觉得好像），swear（发誓），tend（往往会），threaten（预示），undertake（承诺），volunteer（自愿做），vow（发誓），want（想要），wish（希望） 举例： The driver failed to see the other car in time. 司机没能及时看见另一辆车。 I happen to know the answer to your question. 我碰巧知道你那道问题的答案。
当复合宾语中的宾语是不定式时，先用形式宾语it代替不定式，把不定
式置于补语之后，即：主语＋动 词＋it＋补语＋to do句式。如：
We think it quite important for us to learn a foreignlanguage well.
He feels it his duty to help the poor.
③介词but,except,besides+to do(do)
在这种句型中，如介词前有动词do，后面应接不带to的不定式；如无do，
则接to不定式，即带do不带to， 带to不带do。如：
The enemy soldiers had no choice but to give in.
On Sunday afternoon I had nothing to do but watch TV.
①以下动词后，只能接动名词作宾语，如：
admit,appreciate,consider,delay,enjoy,finish,keep,imag
ine,mind,miss,practise,resist,risk,save,suggest,don't mind,give
up,insist,on, put off等。如：
I suggest spending our summer vacation in a seaside town.
You must give up smoking, for it does too much harm toyour health.
②动名词作介词的宾语
I should go to attend the birthday celebration instead of staying at home.
What about inviting Li Jun to make a speech?
动名词前的介词有时可以省略，如：have difficulty(in)doing,have no
trouble(in)doing,lose no ti
me(in)doing,prevent/stop…(from)doing,there is no use(in)doing等。
部分动词后面，既可接动词不定式，也可接动名词作宾语，意义不变。如：
begin,continue,start,hat e,like,love,need,require,want等。
在need,require,want后接-ing形式，表示被动意义，也可接不定式，但
要用被动形式，如：Your handwr iting needs improving(tobe improved).
hate, love, like接不定式表示特定的未来事件，接动名词表示目前 正在进行的活动或一般的行为。
在下列情况下，一般要用不定式：
①hate, like, love前有would(should)时，如：I'd like to have a cup of coffee.
②当谓语动词begin,continue,start等是进行式时，如：The students are starting to work on the difficult maths problem.
begin, began to understand what was happening.
⒋ advise, allow, encourage, forbid, permit等动词后接动名词作宾语，或带不定式作宾语补足语。如：
Our teachers don't permit our swimming in the lake.
Our teachers don't permit us to swim in the lake.
⒌ 部分动词后接不定式或动名词时，意义差别较大，应根据句子语境选择使
用。
①forget, remember, regret后接不定式，表示现在或未来的动作，接动名 词表示动作已经发生。如：
Don't forget fo post the letter for me.
Have you forgotten meeting her in Beijing Airport?
Remember to close the windows before you leave.
I remember writing him a letter a year ago.
We regret to tell you that all of you are not invited toattend the meeting.
They regretted ordering these books from abroad.
②mean to do 打算做某事
doing 意味着……
I meant to catch up with the early bus.
This means wasting a lot of money.
③try to do 设法尽力做某事
doing 试着做某事
You should try to overcome your shortcomings.
Try working out the physics problem in another way.
④stop to do 停下一件事去做另一件事（不定式作目的状语）
doing 停止做某事
On the way to the airport,I stopped to buy a paper.
You'd better stop arguing and do as you are told.
⑤can't help doing 禁不住……
to do不能帮助干……
They couldn't help jumping up at the news.
Sorry I have lots of work to do.So I can't help to make up the room for you.
⑥go on to do 做不同的事或不同内容的事
doing 继续不停地做某事，指同一动作的继续
He went on to talk about world situation.他接着又谈了世界形势。
We'll go on fighting so long as there is oppression inthe world.
⑦leave off to do 离开某地去干什么（目的状语）
doing停下某事
It's time to leave off talking and to start acting.
They left off to go fishing.
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