9、 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。
10、 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。
11、 不定式的特殊句型too…to…
1）too…to 太…以至于…
He is too excited to speak.
他太激動(dòng)了，說(shuō)不出話(huà)來(lái)。
---- Can I help you ? 需要我?guī)兔?
---- Well, I’m afraid the box is too heavy for you to carry it, but thank you all the same. 不用了。這箱子太重，恐怕你搬不動(dòng)。謝謝您。
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。
10、 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。
11、 不定式的特殊句型too…to…
1）too…to 太…以至于…
He is too excited to speak.
他太激動(dòng)了，說(shuō)不出話(huà)來(lái)。
---- Can I help you ? 需要我?guī)兔?
---- Well, I’m afraid the box is too heavy for you to carry it, but thank you all the same. 不用了。這箱子太重，恐怕你搬不動(dòng)。謝謝您。