带to.如：
She could do nothing but cry. What do you like to do besides swim?
I have no choice but to go.
作定语的不定式如果是不及物动词,或者不定式所修饰的名词或代词是不定式动作的地点、工具等,不定式后面须有相应的介词。例如：
He is looking for a room to live in. There is nothing to worry about.
Please give me a knife to cut with.
在 It is no use/good,not any use/good,useless,There is no 等后必须用动名词。
2)作表语。例如：Her job is teaching.
3)作宾语。例如：He is fond of playing football. I like swimming.
注① admit,appreciate,avoid,consider,delay,dislike,enjoy,escape,excuse,face,feel like,finish,forgive,give up,imagine,include, keep,mention,mind,miss,practise,put off,resist,risk,suggest, can't help, can't stand(无法忍受)等动词后可以用动名词作宾语,但不能用不定式。
注②forget, go on,like,mean,regret, remember, stop, try等动词可带动名词或不定式作宾语,但意义上有区别。
I remember doing the exercise .(我记得做过练习。)
I must remember to do it .(我必须记着做这事。)
I tried not to go there.(我设法不去那里。)
I tried doing it again.(我试着又干了一次。)]
Stop speaking .(不要讲话。)He stopped to talk .(他停下来讲话。)
mean to do 有意... mean doing意味着...
I mean to come early today.(我打算今天早些来。)
Missing the train means waiting for another hour.
(误了这趟火车意味着再等一个小时。)
注③在allow, advise, forbid, permit 等动词后直接跟动词作宾语时,要用动名词形式,如果后面有名词或代词作宾语,然后再跟动词作宾语补足语时,其宾语补足语用带to的不定式。例如：
We don't allow smoking here. We don't allow studen

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