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不定式動詞:to的動詞不定式

2016-11-08 17:50:56  來源:網(wǎng)絡(luò)整理

  不定式動詞主要包括以下類別:

  1)情態(tài)動詞(除ought外,ought to):

  2)使役動詞let,have,make:

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

  注意:在被動語態(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前是動詞do時,后面出現(xiàn)的動詞用不帶to的動詞不定式。

  8)由and,or和than連接的兩個不定式,第二個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的動詞不定式,當(dāng)其用于被動時,to不可省略。

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