八年级英语动词不定式用法梳理.docx
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八年级英语动词不定式用法梳理.docx
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八年级英语动词不定式用法梳理
八年级英语动词不定式用法梳理
动词不定式是由“不定式符号to+动词原形”构成的一种非谓语动词结构。
有些动词不定式不带to,动词不定式可以作句子的主语、表语、宾语、定语、补语、状语或单独使用。
不定式保留动词的某些特性,可以有自己的宾语、状语等。
动词不定式和它后面的宾语、状语等一起构成短语,叫作不定式短语。
一、用作主语
多数情况用it作形式主语,把真正的主语——动词不定式置于句末,特别是不定式短语较长时。
动词不定式作主语,谓语动词用第三人称单数形式。
疑问词+不定式短语作主语可置于句首,复合不定式结构作主语常置于句末。
如:
1.Itisourdutytotryourbesttodealwiththese
problems.
2.Theheadteachersaiditwasnecessarytotalkwith
hismother.
3.HowtolearnEnglishwellisimportant.
4.Toseeistobelieve.(眼见为实;百闻不如一见)
二、用作表语动词不定式作表语,常说明主语的内容、性质、特征。
如:
1.ThebestwayistojoinanEnglishclub.
2.Thefirstthingistolistentotheteachercarefully.
三、用作宾语
1.可以接带to的动词不定式作宾语的动词主要有:
要求选择同意(ask,choose,agree),期望决定学习(expect,hope,decide,learn),宁可假装知道(prefer,pretend,know),
希望想要愿意(wish,want,wouldlike/love)。
如:
1)Wedecidedtotalktosomestudentsaboutwhytheygothere.
2)Hepreferstoeatwhitebreadandrice.
3)IdlovetovisitMexico.
2.动词decide,know,learn,show,teach,tell...,介
词结构on...可用疑问词带to的不定式短语作宾语,但why后面的不定式不带to。
如:
1)Couldyoupleasetellmewheretoparkmycar?
2)Itgivesadviceonwhattodoinlotsofdifferentsituations.
3.动词feel,find,make,think等后面,可以用it作形
式宾语代替真正的宾语——动词不定式,句子结构是...feel/find/make/...it+adj./n.+todo...。
如:
4.感知动词like,love,know等一般不用进行时态
5.后接动词不定式或ving形式作宾语,意思差别较大的动词有forget,remember等。
后接不定式作宾语,表动作尚未发生;后接ving形式作宾语,表动作已经发生。
stoptodo停下来做另外一件事,todo是目的状语;stopdoing停止做、不做当前这件事,doing是宾语。
trytodo尽力做,trydoing试试看;goontodo接着做另外的事,goondoing继续做原来的事。
如:
1)WhenIlefthome,Iforgottobringitwithme.
2)Istoppedusingthemlastyear.
四、用作定语
1.句子的主语或宾语是动词不定式的逻辑主语,不定式与其所修饰的名词、代词等存在逻辑的动宾关系.
1)Ihavesomanyclothestowashtoday.
2)Ican'tthinkofanygoodadvicetogiveher.
3)Wehavenohousestolivein.
2.动词不定式所修饰的名词是place,time,way等时,不定式与这些名词呈现出动状关系或同位关系。
如:
1)Heneeds
timetodohomework.
2)Hewantstoknowthebestwaytotravelaroundthe
city.
3.在“therebe...”句型里,句子的主语是动词不定式动
作的对象:
1)There'sjustsomuchtoseeanddohere.
2)...buttherearestillmanythingstodothe
五、用作宾语补足语
1.带to的动词不定式作宾语补足语的动词主要有:
要求允许提议(ask,allow,,advise),期望邀请鼓励(expect,,invite,encourage),教导告诉想要(teach,tell,want),等待希望愿意(waitfor,wish,wouldlike/love)。
如:
1)Idinvitehertohavedinneratmyhouse.
2Weshouldallowthechildrentochoosetheirownclothes.
2.动词不定式作补语,在主动语态句里不带to,被动语态句里带to时多数动词是感官动词和使役动词,包括四“看”:
lookat,observe,see,watch,三“让”:
have,let,make,二“听”:
hear,listento,一“感觉”:
feel,一“注意”:
notice。
如:
1)Thispicturemakesmefeelexcited!
2)WesawLiuYuplaybaseballlastweek.
3.help后接动词不定式作补语,to可带可不带。
1)theycanhelpyoutolearnEnglish.
2)UsingemailEnglishhelpsyouwritequickly.
六、用作状语
1.目的状语,置于句首或句末,置于句首时常表示强调。
如:
1)Inordertocatchtheearlybus,shegotupveryearly.2)Agroupofyoungpeoplegottogethertodiscussthisquestion.
3)Shecametothiscitytovisitherdaughter.
2.原因状语,多见于“sb.+be+adj.+todo...”结构句中。
如:
1)Ifeelveryluckytohavehim.
2)heranoutofmoneytobuyoldbikes.
3.结果状语,多见于“too...to”,“enoughto...”结构句中。
如:
1)I'mtootiredtodoitwell.
2)Theroomisbigenoughforthreepeopletolivein.
七、动词不定式的复合结构
动词不定式的复合结构是“for/ofsb.todosth.”,for
/of引出不定式动作的逻辑主语。
这种结构在句子中可以作主语、宾语、表语、定语、状语等。
不定式复合结构的介词用for还是of,主要决定于前面形容词的性质。
一般说来,of前面的形容词是careful,clever,foolish,good,kind,nice,wise等,既说明人的特性,又说明不定式动作的特性。
for前面的形容词是dangerous,difficult,easy,hard,heavy,important,interesting,necessary等,一般说明
不定式动作的特性,前面如果是名词用for。
如:
1.It'sagoodideaforparentstoallowchildrentostudyingroupsduringtheevening.
2.It'swiseofhimtodoitwell.
3)Isitinterestingforthebabytoplaywithapetdog?
八、带疑问词的不定式短语
动词不定式前面可以带疑问代词what,which,who或疑问副词how,when,where,why等。
这种结构起名词的作用,在句子里用作宾语、主语、表语等,或者单独使用。
要注意的是,why后面的不定式不带to。
如:
1.用作句子的成分。
1)Idon'tknowwhattotrynext.(作宾语)
2)Wheretogoisnotdecidedyet.(作主语)
2.单独使用时相当于一个特殊疑问句。
1)Whattodonext?
(=Whatwillwe/youdonext?
2)Whygothere?
(=Whydowe/yougothere?
九、动词不定式的否定式
不定式的否定式是not/nevertodo...,不带to的不定式的否定式是not/neverdo...如:
1.Theydecidenottotalktoeachother.
2.Hisparentstellhimnevertoplaysoccerinthestreet.
动词填空。
随堂练习
1.1'mgoingtolistentotheradio.Please(nottalk)anymore.2.
Thestudents(do)theirhomeworkfromfourtofivethisafternoon.
3.Thestudents(be)busynow.They(have)anEnglishexamnext
Monday.
4.Marymust(look)afterherlittlesisterbecausesheistooyoung.
5.(he)youwaitingforabusnow?
6.Thiscoatisverycheap.I(take)itnow.
7.1'lltellhimaboutitwhenhe(comeback.
8.Couldyoutellmehow.I(canget)toNo3Middleschool.
9.Hesaidthatthenewteacher(give)thestudentsanEnglish
lessonnow.
10.I(milk)acowthreetimes.
11.Edison'smother(teach)himherself.
12.He(watch)TVonceaweek.
13.Don'tspeakloudly.Thebaby(sleep).
14.1won'tgooutuntil.I(finish)myhomework.
15.Couldyoutellmewhenthetrain(arrive).
16.1oftenhearthesoundofchildren(read)Englishintheroom.
17.Heaskedme(help)himwithhisEnglishthisevening.
18.Theirworkis(clean)thestreets.
19.Didheenjoy(work)inChina.
20.Wewillstayathomeifit(rain)tomorrow.
21.Bequiet!
Theboy(sing)anEnglishsong.
22.youyourhomeworkyet(start)?
23.Who(teach)themEnglishlastterm.
24.There(be)atelephonecallforyoujustnow.
25.Pleasekeepeverything(clean).
26.Peterwon'thavearestuntilhe(finish)hiswork.
27.1watchedTV,soI(forget)(do)myhomework.
28.WhenI(walk)alongtheriver,Imetmyfriend,Tom.
29.WhenMothercame,thelittlegirl(play)withacat.
30.Whenlwasfive,I(get)toknowtheearth(movearound
thesun.
31.They(see)aboy(fall)intotheriverwhilethey
(pass)ityesterday.
32.(study)hardatyourlessonsand(nottalk)inclass.
33.You(have)better(noteat)thebadfood.
34.WhileI(do)myhomeworkmyparents_(watch)TV.
35.He(notfinish)(read)thebook.
36.I(get)upveryearlythismorning.I(read)Englishnow.
37.He(hurry)toschooleverymorning.
38.Ourteacher(notstop)(work)untileleveno'clocklast
night.
39.Ifhe(know)it,he(be)veryhappy.
40.It(take)ushalfanhour(read)Englisheveryday.
41.Thechildren(run)inthestreetnow.
42.There(be)twomeetingstomorrowmorning.
43.Myfather(sleep)whenI(get)upthismorning.
44.WhenI(go)toseeTom,he(notwrite)anything.
45.Sorry,whenyou(call)meI(think)and(nothear)
you.
46.Mr.Green(leave)hisnotebookathomeyesterday.
47.I(want)tobuyanewcoatnextSunday.
48.Hisfather(read)newspaperwhenIgotthere.
49.It(be)fiveyearssincehe(buy)themotorbike.
50.Wefounditwasverydifficult(get)acar.
51.Wearesoglad(hear)thenews.
52.1sawhim(cross)theroadsafelyand(run)
away.
53.Youcan'tmakehim(do)whatyouwant.
54.Idon'tknowwhere(meet)him.
55.Whatmakesyou(think)I'mafarmer?
56.Didyouseehim(go)upstairs?
57.Itisbetter(put)yourmoneyinabank.
58.Itisdifficultfortheboy(swim)acrosstheriver.
59.1lethim(go)earlyashewanted(meet)
hisuncleatthestation.
60.Willyouhelpme(move)thebed?
61.Ifhedoesn'tknow,how(use)therecorder,you'd
better(show)him.
62.Heisthelastone(leave)theofficeeveryday.
63.It'sbadmanners(shout)inpublic.
64.Theboyisoldenough(dress)himself.
65.Sheistooill(go)toschool.
二选择题
1.Tellhim___thewindow.
A.toclosenotB.nottocloseC.tonotcloseD.notclose
2.Pauldoesn'thavetobemade___.Healwaysworkshard.
A.learnB.tolearnC.learnedD.learning
3.You'dbetterthestoryinJapanese.
A.sayB.speakC.tellD.talk
4.Thepatientwaswarned___oilyfoodaftertheoperation.
A.toeatnotB.eatingnotC.nottoeatD.noteating
5.Iusuallygotherebytrain.
Whynot___byboatforachange?
A.totrygoingB.tryingtogoC.totryandgoD.
trygoing
6.Therearesomebooksonthefloor,wouldyoulike?
pickupit
7.Sheisveryill,let'sadoctoratonce.
A.towakeupB.sendforC.topayforD.payfor
8.IwantateacherwhenIgrowup.
A.tobeB.toC.beD.being
9.It'scoldhere.You'dbetteryourcoat.
A.nottakeoutB.nottotakedownC.nottakeoffD.
nottotakeaway
10.Mymothertoldmemorewater.
A.drinkingB.drankC.todrinkD.drink
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