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2012寧波小升初英語(yǔ)動(dòng)詞不定式講解(3)

來(lái)源:寧波奧數(shù)網(wǎng)整理 2011-12-16 10:40:32

智能內(nèi)容

  用作介詞的to

  to 有兩種用法:一為不定式+動(dòng)詞原形; 一為介詞+名詞/動(dòng)名詞, to 在下面的用法中是第二種,即to+ 名詞/動(dòng)名詞:admit to承認(rèn),confess to承認(rèn),be accustomed to 習(xí)慣于,be used to 習(xí)慣于,stick to 堅(jiān)持,turn to開(kāi)始,著手于,devote oneself to 獻(xiàn)身于,be devoted to 致力于, look forward to 盼望,pay attention to

  注意

  省to 的動(dòng)詞不定式

  1) 情態(tài)動(dòng)詞 ( 除ought 外,ought to):

  2) 使役動(dòng)詞 let, have, make:

  3) 感官動(dòng)詞 see, watch, look at, notice , observe, hear, listen to, smell, feel, find 等后作賓補(bǔ),省略to。

  注意

  在被動(dòng)語(yǔ)態(tài)中則to 不能省掉。

  I saw him dance. =He was seen to dance。

  The boss made them work the whole night.=They were made to work the whole night。

  4) would rather,had better:

  5) Why… / why not…:

  6) help 可帶to,也可不帶to, help sb (to) do sth:

  7) but和except:but前是動(dòng)詞do時(shí),后面出現(xiàn)的動(dòng)詞用不帶to的動(dòng)詞不定式。

  8) 由and, or和than連接的兩個(gè)不定式,第二個(gè)to 可以省去:

  9) 通常在discover, imagine, suppose, think, understand等詞后,可以省去to be:He is supposed (to be) nice. 他應(yīng)該是個(gè)好人。舉例:He wants to move to France and marry the girl. He wants to do nothing but go out. 比較:He wants to do nothing but go out. He wants to believe anything but to take the medicine。

  典型例題

  1) ---- I usually go there by train.

  ---- Why not ___ by boat for a change?

  A. to try going  B. trying to go  C. to try and go  D. try going

  答案:D. why not 后面接不帶to 的不定式,因此選D。

  2) Paul doesn't have to be made ___. He always works hard.

  A. learn  B. to learn  C. learned  D. learning

  答案:B. make后接不帶to 的動(dòng)詞不定式,當(dāng)其用于被動(dòng)時(shí),to 不可省略。

  動(dòng)詞不定式的否定式

  Tell him not to shut the window…

  She pretended not to see me when I passed by. 我走過(guò)的時(shí)候,她假裝沒(méi)看見(jiàn)。

  典型例題

  1) Tell him ___ the window.

  A. to shut not  B. not to shut  C. to not shut  D. not shut

  答案:B。 tell sb to do sth 的否定形式為tell sb not to do sth。

  2) She pretended ___ me when I passed by.

  A. not to see  B. not seeing  C. to not see  D. having not seen

  答案:A。 pretend 后應(yīng)接不定式。其否定形式為pretend not to do sth.。

  3) Mrs. Smith warned her daughter ___ after drinking。

  A. never to drive  B. to never driver C. never driving  D. never drive

  答案:A。warn sb to do sth. 的否定形式為warn sb not to do sth. 此處用的是否定詞never。

  4) The boy wanted to ride his bicycle in the street,but his mother told him ____.

  A. not to  B. not to do  C. not do it D. do not to

  答案:A。not to 為not to do it 的省略形式?梢灾挥胻o這個(gè)詞,而不必重復(fù)整個(gè)不定式詞組。及物動(dòng)詞do后應(yīng)有名詞、代詞等,否則不對(duì),因此B,D不對(duì)。

  5) The patient was warned ___ oily food after the operation。

  A. to eat no  B. eating not  C. not to eat D. not eating

  答案:C。warn一詞要求后用不定式,此處為不定式的被動(dòng),否定形式為be warned not to do。

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