不定式常見用法例析

安徽省碭山鐵路中學西校區　王瑾瑾

不定式常見用法例析

安徽省碭山鐵路中學西校區王瑾瑾

不定式是非謂語動詞的一種，也是我們現階段英語學習的重點。不定式到底有哪些用法呢？讓我們從一些題目中來看一看吧。

用法一：作主語

It's standard practice for a companylike this one_______a securityofficer.

A.employedB.being employedC.toemployD.employs

解析本題考查固定句型：It+be+n+for sb./sth.todo...,考點為不定式作主語，故答案為C。

對不定式作主語的考查，常常以固定句型的形式出現，主要有以下5種句型：

①It+be+名詞+to do...

e.g.：It's our duty to take good care of the old.

②It+be+形容詞+for sb.+to do...

e.g.：It is difficult for us to finish the task in an hour.

③It+be+形容詞+of sb.+to do...

e.g.：It is stupid of you to write down everything the teacher says.

④It takes sb.+some time+to do...

e.g.：How long did it take you to finish the work？

⑤It seems+形容詞+to do...

e.g.：It seemed impossible to save money.

只要熟記這些句型，不定式作主語的題目就能迎刃而解了。

用法二：作賓語

1.David threatened_______his neighbor tothe police if the damage were not paid.

A.tobe reportedB.reportingC.toreportD.having reported.

2.Susan wanted to be independent of her parents.She tried_______alone，but she didn't like it and moved back home.

A.livingB.to liveC.tobe livingD.having lived

解析1.考查不定式作賓語。threatened的后面只能接不定式作賓語，句中表示“大衛威脅鄰居如果損害沒有得到賠償，他將報警”。故答案為C。

考點分析：下列動詞后面只能接不定式作賓語：決心學會想希望，設法拒絕愿假裝，主動答應選計劃，同意請求幫一幫。這一順口溜對應下列單詞：decide/determine，learn，want，hope/wish/expect，manage，refuse，care，pretend，offer，promise，choose，plan，agree，ask/beg，help。我們記住了這個順口溜，做題的時候就能事半功倍了。

2.考查不定式和動名詞作賓語時的區別。此時要注意區分：trydoing意為“嘗試做……”，而try to do意為”努力去做……”。根據句意“蘇珊不想再依靠父母，她嘗試獨自居住但并不喜歡，最后又搬回了家”確定答案為A。類似的詞還有can't help，go on，mean，for get，remember，regret，stop及try，要注意他們后面跟動名詞和不定式時意義上的區別。

牛刀小試：

1.The boy pretended_______when his mother entered.

A.readingB.toreadC.tobe readingD.beingread

2.Nervous and anxious，Jill failed_______a good impression at the job interview.

A.tohave madeB.makingC.tomakeD.having made

3.We find it impossible for the work_______ahead of time.

A.tofinishB.finishingC.being finishedD.to be finished

4.—What about your adventure in the forest last week？

—Wonderful！I didn't expect there_______so many lovely monkeys！

A.to beB.beingC.of beingD.be

答案1.C2.A3.D4.A

用法三：作表語

Ladies and gentlemen，please remain_______until the plane has come to a complete stop.

A.seatedB.seatingC.to seatD.seat

解析不定式作表語?？疾橄祫釉~remain后面的情況。remain作“尚待，留待”講時，后加“tobe done”作表語；remain作“仍然”時，后面加現在分詞或過去分詞作表語。因此答案為B。

用法四：作定語

1.There are still many problems_______before we are ready for a longstayon the Moon.

A.solvingB.solvedC.being solvedD.to be solved

2.The airport_______next year will help promote tourismin this area.

A.being completedB.tobe completedC.completedD.having been completed

不定式作后置定語時，修飾前面的名詞或代詞，表示不定式動作尚未發生或將要進行。

解析1.在there be結構中，當說話人強調的是必須有人去完成某件事情時，不定式用主動形式；如果說話人強調的是事情本身必須被完成，不定式則用被動形式。本題題意為“在我們準備在月球上長期生活之前，還有很多問題有待于解決?！狈治鼍渥咏Y構得知，空處在句中作定語。又根據語境可知此處表示沒有發生的事情，應用不定式，又因為solve和problems之間為動賓關系，因此用不定式的被動式，故選擇D。

2.分析句子結構得知，空處在句中作定語。又根據語境可知此處表示沒有發生的事情，應用不定式，又因為complete和airport之間為動賓關系，因此用不定式的被動式，故選擇B。

牛刀小試：

1.The pressure_______causes Americans to be energetic，but it also puts them under a constant emotional strain.

A.tocompeteB.tobe competedC.competingD.having competed

2.Could you find someone_______？

A.for me to play tennis withB.for me to play tennis

C.playtennis withD.playing tennis

3.With a lot of difficult problems_______，the newly-elected president is havinga hard time.

A.settledB.settlingC.tosettleD.being settled

答案1.A2.A3.C

用法五：作狀語

1.Group activities will be organized after class_______children develop teamspirit.

A.helpingB.having helpedC.helpedD.tohelp

2._______our selves from the physical and mental tensions，we each need deep thought and inner quietness.

A.Having freedB.FreedC.TofreeD.Freeing

解析1.分析句子可知道這里需要目的狀語，句意為“為了幫助孩子們培養團隊精神，下課后將組織小組活動”。目的狀語通常用不定式表示。故選擇D。

2.根據題干和句意可知本題考查不定式作目的狀語，相對于上一題，本題結構更清晰。句意為“為了讓我們從身體和精神的緊張中放松下來，我們都需要深刻的思考和內心的平靜?！惫蔬x擇C。綜合這兩題，我們得出結論：目的狀語通常用動詞不定式表示。

牛刀小試：

A.tobe toldB.tellingC.being toldD.told

2.The air is very hard to _______in Tibet because of the high altitude.

A.breath inB.be breathed inC.breathD.be breathed

答案1.A2.C

用法六：作補語

Ⅰ.作賓語補足語

1.I advised him_______smoking，but he wouldn't listen.

A.give upB.togive upC.givingupD.tobe given up

2.Whom would you like_______with you，John or me？

A.goB.have goneC.have goD.to go

解析這兩題考查一些動詞后面用動詞不定式作賓語補足語的情況。常見的結構為：advise/allow/ask/expect/encourage/get/invite/like/persuade/remind/require/suppose/ tell/want/warn/wish/would like/call on/depend on+sb.+（not）to do sth.。故第1題選擇B，第2題選擇D。

Ⅱ.作主語補足語

1.Passengers are permitted_______only one piece of hand luggage on to the plane.

A.tocarryB.carryingC.tobe carriedD.beingcarried

2.He is thought_______foolishly.Nowhe has noone but himself to blame for losing the job.

A.toactB.tohave actedC.actingD.having acted

解析主語補足語的出現是因為原來含有賓語補足語的句子變成了被動句，因此，原來的賓語就變成了新句子的主語，那么原來的賓語補足語就變成了新句子的主語補足語了。因此，我們做題的時候只要將結構還原成原來的主動句就可以了。

1.分析題目知道句意是“旅客僅被允許攜帶一件手提行李上飛機”，permit sb.to do sth.結構變成被動為sb.be permitted to do sth.，因此選項為A。

2.本題考查sb./sth.be said/believed/known/supposed/reported/considered/found/thought...+to do sth./tobe done/to have done/to have been done，本結構中，用to do表示尚未發生的動作，用tohave done表示已經發生的動作。根據句意“他被認為表現得很愚蠢”，表示已經發生了的動作，故選擇B。

牛刀小試：

1.They knew her very well.They had seen her_______up from childhood.

A.growB.grewC.was growingD.togrow

2.The teacher asked us_______somuch noise.

A.don't makeB.not makeC.not makingD.not tomake

3.My advisor encouraged________a summer course to improve my writing skills.

A.for me takingB.me takingC.for me totakeD.me totake

4.The flu is believed_______by viruses that like to reproduce in the cells inside the human nose and throat.

A.causingB.beingcausedC.tobe causedD.tohave caused

5.—Is Bob still performing？

—I'mafraid not.He is said_______the stage a lready as he has become an official.

A.to have leftB.to leaveC.to have been leftD.to be left

答案1.A2.D3.D4.C5.A

1.George after the war，only_______that his wife had left him.