动词不定式.ppt

动词不定式
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不定式定义：由to+动词原形构成。不定式是一种非限定性动词。而非限定动词是指那些在句中不能单独充当谓语的动词，可分为不定式，动名词，现在分词和过去分词。“动词不定式”由动词+不定式构成。。(但没来)
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C .用在seem, appear, thing, consider, believe等后，表示一个动作先于另一个动作发生。
I seem to have seen her somewhere 。（see在seem之前发生）
He was believed to have been a 。
比较：
She seems to have been ill.= It seems that she has been 。
She seemed to have been ill.= It seemed that she had been 。
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d. 在should(would) like 或should(would)have like后用不定式完成式表示没有实现的愿望。
I should like to have gone with 。（但没去）
I would like to have seen her face when she read the 。（但没看到）
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语法功能 :
1 不定式作宾语
1) 动词+ 不定式
afford, aim, appear, agree, arrange, ask, be, decide, bother, care, choose, come, dare, demand, desire, determine, expect, elect, endeavor, hope, fail, happen, help, hesitate, learn, long, mean, manage, offer, ought, plan, prepare, pretend, promise, refuse, seem, tend, wait, wish, undertake
The driver failed to see the other car in time.　司机没能及时看见另一辆车。
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2) 动词+不定式；动词+宾语+不定式
ask, beg, choose, expect, hate, help intend like, love, need prefer, prepare, promise, want, wish
I like to keep everything tidy.　我喜欢每件东西都保持整洁。
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3) 动词+疑问词+ to
decide, know, consider forget, learn, remember, show, understand, see, wonder, hear, find out, explain, tell　　
Please show us how to do that. 请演示给我们如何去做。
注意
疑问词带不定式在句中作成分时，谓语动词用单数。如：The question is how to put it into practice. 问题是怎样把它付诸实施。
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2. 不定式作补语
1) 动词+宾语+不定式(to do)
advise, allow, appoint, believe, cause, challenge, command, compel, consider, declare, drive, enable, encourage, find, forbid, force, guess, hire, imagine, impel, induce, inform, instruct, invite, judge, know, like, order, permit, persuade, remind, report, request, require, select, send, state, suppose, tell, think, train, trust, understand, urge, warn
Father will not allow us to play on the street.　父亲不让我们在街上玩耍。
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