【小編寄語】今天查字典英語網小編教給同學們的是英語中不定式作狀語的用法，一起來學習下吧!祝同學們學習進步!
1) 目的狀語
To only to , in order to, so as to, so as to
He ran so fast as to catch the first bus. 他飛快地跑以便趕上第一班車。
I come here only to say good-bye to you. 我來僅僅是向你告別。
2) 作結果狀語，表事先沒有預料到的，要放在句子後面。
What have I said to make you angry.
He searched the room only to find nothing.
3) 表原因
I'm glad to see you.
典型例題
The chair looks rather hard, but in fact it is very comfortable to ___.
A. sit B. sit on C. be seat D. be sat on
答案：B. 如果不定式為不及物動詞，其後應有必要的介詞。當動詞與介詞連用時，常位於"形容詞+動詞不定式"結構的末尾。
1) 目的狀語
To only to , in order to, so as to, so as to
He ran so fast as to catch the first bus. 他飛快地跑以便趕上第一班車。
I come here only to say good-bye to you. 我來僅僅是向你告別。
2) 作結果狀語，表事先沒有預料到的，要放在句子後面。
What have I said to make you angry.
He searched the room only to find nothing.
3) 表原因
I'm glad to see you.
典型例題
The chair looks rather hard, but in fact it is very comfortable to ___.
A. sit B. sit on C. be seat D. be sat on
答案：B. 如果不定式為不及物動詞，其後應有必要的介詞。當動詞與介詞連用時，常位於"形容詞+動詞不定式"結構的末尾。
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 後面接不帶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後接不帶to 的動詞不定式，當其用於被動時，to 不可省略。
動詞不定式的否定式
Tell him not to shut the window
She pretended not to see me when I passed by. 我走過的時候，她假裝沒看見。
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 後應接不定式。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。可以只用to這個詞，而不必重複整個不定式詞組。及物動詞do後應有名詞、代詞等，否則不對，因此B，D不對。
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一詞要求後用不定式，此處為不定式的被動，否定形式為be warned not to do。
不定式的特殊句型tooto
1) tooto 太以至於
He is too excited to speak. 他太激動了，說不出話來。
---- Can I help you ? 需要我幫忙嗎?
---- 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。謝謝您。
2) 如在too前有否定詞，則整個句子用否定詞表達肯定， too 後那個詞表達一種委婉含義，意 為"不太"。
It's never too late to mend. 改過不嫌晚。
3) 當too 前面有only, all, but時，意思是：非常 等於very。
I'm only too pleased to be able to help you. 我非常高興能幫助你。
He was but too eager to get home. 他非常想回家。
不定式的特殊句型so as to
1) 表示目的;它的否定式是so as not to do。
Tom kept quiet about the accident so as not to lose his job. 湯姆對事故保持沉默是為了不丟掉他的工作。
Go in quietly so as not to wake the baby. 輕點進去，別驚醒了嬰兒。
2) so kind as to ---勞駕
Would you be so kind as to tell me the time? 勞駕，現在幾點了。
不定式的特殊句型Why not
"Why not +動詞原形"表達向某人提出建議，翻譯為："為什麼不?" "幹嗎不?"
例如：Why not take a holiday? 幹嗎不去度假?
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