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，翻譯爲："爲什麼不……?" "幹嗎不……?"
例如：
Why not take a holiday?
幹嗎不去度假?
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 的否定形式爲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。其否定形式爲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. 的否定形式爲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 爲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，此處爲不定式的被動，否定形式爲be warned not to do。
不定式的特殊句型too…to…
1）too…to 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 爲"不太"。
It's never too late to mend. (諺語)
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爲了不丟掉他的工作。
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。
不定式的時態和語態
時態語態 主動 被動
一般式 to do to be done
進行式 to be doing
完成式 to have done to have been done
完成進行式 to have been doing
1) 現在時：一般現在時表示的動詞，有時與謂語動詞表示的動作同時發生，有時發生在謂語動詞的動作之後。
He seems to know this.
I hope to see you again. = I hope that I'll see you again. 我希望再見到你。
2) 完成時：表示的動作發生在謂語動詞表示的動作之前。
I'm sorry to have given you so much trouble.
He seems to have caught a cold.
3) 進行時： 表示動作正在進行，與謂語動詞表示的動作同時發生。
He seems to be eating something.
4) 完成進行時：
She is known to have been wreaking on the problem for many years.
動名詞與不定式
1） 動名詞與不定式的區別：
動名詞表達的是： 狀態，性質，心境，抽象，經常性，已發生的
不定式表達的是： 目的，結果，原因，具體，一次性，將發生的
2） 接不定式或動名詞，意義相同。
3） 動名詞與不定式語義不同的`有11 組：
1 stop to do stop doing
2 forget to do forget doing
3 remember to do remember doing
4 regret to do regret doing
5 cease to do cease doing
6 try to do try doing
7 go on to do go on doing
8 afraid to do afraid doing
9 interested to do interested doing
10 mean to do mean doing
11 begin/ start to do begin/ start doing 動名詞與不定式
1） 動名詞與不定式的區別：動名詞與不定式
1） 動名詞與不定式的區別：
動名詞表達的是： 狀態，性質，心境，抽象，經常性，已發生的
不定式表達的是： 目的，結果，原因，具體，一次性，將發生的
2） 接不定式或動名詞，意義相同。
3） 動名詞與不定式語義不同的有11 組：
1 stop to do stop doing
2 forget to do forget doing
3 remember to do remember doing
4 regret to do regret doing
5 cease to do cease doing
6 try to do try doing
7 go on to do go on doing
8 afraid to do afraid doing
9 interested to do interested doing
10 mean to do mean doing
11 begin/ start to do begin/ start doing
動名詞表達的是： 狀態，性質，心境，抽象，經常性，已發生的
不定式表達的是： 目的，結果，原因，具體，一次性，將發生的
2） 接不定式或動名詞，意義相同。
3） 動名詞與不定式語義不同的有11 組：
1 stop to do stop doing
2 forget to do forget doing
3 remember to do remember doing
4 regret to do regret doing
5 cease to do cease doing
6 try to do try doing
7 go on to do go on doing
8 afraid to do afraid doing
9 interested to do interested doing
10 mean to do mean doing
11 begin/ start to do begin/ start doing
