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 為"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?
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：
stop to do
stop doing
forget to
do forget doing
remember to
do remember doing
cease to do
cease doing
try to do
try doing
go on to do
go on doing
afraid to
do afraid doing
interested
to do interested doing
mean to do
mean doing
regret to
do regret doing
begin/start
to do begin/start doing
特殊詞精講
stop
doing/to do
stop to do 停止，中斷做某事後去做另一件事。
stop doing 停止做某事。
They stop
to smoke a cigarette. 他們停下來，抽了根煙。
I must stop
smoking. 我必須戒煙了。
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