牛津必修第三册Unit2-Grammar语法动词不定式(1)ppt课件.pptx
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1、高一英语组高一英语组2021年年3月月9日日 动词不定式的基本结构动词不定式的基本结构主动形式主动形式被动形式被动形式一般式一般式to doto be done完成式完成式to have doneto have been done进行式进行式to be doing无无完成进行式完成进行式to have been doing无无一、不定式的语法意义:一、不定式的语法意义:1.不定式一般式:表示的动作与谓语动词表示的动作同时发生,或者发生在它的后面;I heard her sing.(唱和听见同时发生)I expect to come back next Sunday.(“回来”发生在“预计”之后
2、)2.不定式完成式:表示的动作发生在谓语动词表示的动作之前;Zhang Sanfeng,a 13th-century Taoist,was said to have invented tai chi.3.不定式进行式:表示的动作与谓语动词表示的动作同时发生;She seems to be waiting for somebody.When he came to see me,I happened to be taking a bath.4.不定式完成进行式:表示的动作发生在谓语动词表示的动作之前,并延续到那个时候,可能仍在进行;She is said to have been waiting
3、a novel this year.She seemed to have been working on a difficult maths problem.5.主动语态:一般表示主动的意义,但有时也可以表示被动意义;They began to learn Japanese last winter.Some stars are too far to see.(=to be seen)6.被动语态:表示被动的意义;The composition contest is to be held next month.She is anxious to be invited to the ball.二、
4、不定式的句法功能:二、不定式的句法功能:1.作主语:一般表示具体的某次动作。1)不定式作主语时,谓语用单数:To do such things is foolish.2)主系表结构:To see is to believe.3)当主语较长,谓语较短时,常用it做形式主语,将不定式放到谓语的后面。常用于下列结构中:(1)It is/was+adj.+(of sb.)to do(如 good/kind/nice/clever/foolish/selfish)(2)It is+adj.+(for sb.)+to do(如easy/difficult/hard/unwise/possible/nece
5、ssary)(3)It is+a/an+名词+to do.(如a pity/a shame/a pleasure/ones duty/an honor)(4)It takes(sb.)some time/courage/patience to do(5)It requires courage/patience/hard work to do2.作作表语:常表语:常表示将来表示将来的动作或状态。的动作或状态。Her wish is Her wish is to becometo become a lawyer.a lawyer.3.作宾语:ask,agree,care,choose,demand
6、,decide,expect,fail,help,hope,learn,manage,offer,plan,prepare,pretend,promise,refuse,want,wish等只能用动词不定式作宾语。注意注意:1.某些及物动词可用某些及物动词可用-ing也可用动词不定式也可用动词不定式作宾语作宾语但意义不同但意义不同stop/go on/remember/forget/regret/try/mean.2.某些及物动词某些及物动词think,believe,consider,feel,find,make等后常用等后常用it作形式宾语作形式宾语。4作定语:当不定式的逻辑主语是句子的主
7、语时,要用主动表被动。Xiao Li is a very nice person to work with.The pen is very nice to write.(用主动表被动)5.作状语:表示目的、结果、原因和情况,不定式的逻辑主语通常是全句的主语;We also work hand in hand with other branches of government to ensure that developmentHe hurried to the station,only to find the train had left.(出乎意料)5.作状语:表示目的、结果、原因和情况,不
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