2012英语四级语法讲义大全：非谓语动词五

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6）作状语：
* r& b! `1 l! F  c" p! ?0 oA）表目的：
He worked day and night to get the money.
1 n5 q& d" N- n$ YShe sold her hair to buy the watch chain.
注意不定式放句首时，逻辑主语与句子主语要一致：
wrong：To save money, every means has been tried.
' ]& D8 h( d9 v0 q: {right: To save money, he has tried every means.
& _0 P$ t9 W* }0 n) Lwrong：To learn English well, a dictionary is needed.
7 P9 y( }5 r, F( d$ q4 Gright: To learn English well, he needs a dictionary.
% K; }+ Y6 t, g/ i3 vB）表结果：
He arrived late to find the train gone.
! T, y8 M- K. X# [) u8 s常用only放在不定式前表示强调：I visited him only to find him out.
C）表原因：
' |! G  \8 |: LThey were very sad to hear the news.
D）表程度：
* Z: R2 Y. d7 b& gIt’s too dark for us to see anything.
% m2 K8 C  `& lThe question is simple for him to answer.
( p4 v" R3 P2 X' P$ ]* w4 S- a' k# h7）作独立成分：
To tell you the truth, I don’t like the way he talked.
8）不定式的省略：保留to省略do动词。
If you don’t want to do it, you don’t need to.
9）不定式的并列：第二个不定式可省略to。
, q. N7 X. b9 h: R- E/ O; ^He wished to study medicine and become a doctor.