e)在介词 except,but之后,如果其前有动词do的某种形式,不定式一般不带to,反之带to. There is nothing to do except wait till it stops raining Smith will do anything but work on a farm There's no choice but to wait till it stops raining f)连词 rather than, sooner than置于句首时,其后的不定式不带 Rather than push the book back as he wanted to do, he forced himself to pick it up 出现在句中其他位置时,其后的不定式有时带to,有时不带to He decided to write rather than telephone The manager believes it is important to invest in new machinery rather than to increase wages g)用作补语的动词不定式,如果主语是由“al+关系分句”,“ thing+关系分句”,“what分句” 或“ thing+不定式结构”等构成,并带有do的某种形式,这时,作为主语补语的不定式可 以省to,也可以不省 What he will do is(to)spoil the whole thing All you do now is complete the form The only thing I can do now is go on by myself The thing to do now is clear up this mess The least I can do is drive everybody else closer to the issue 4)不定式的其他用法 a)too.to结构通常表示否定意义 She was too young to understand all that enough.to结构则表示肯定意义 She was not old enough to understand all that not too but too, all too, only too等和不定式连用时,不定式一般不表示否定意义 He's only too pleased to help her so.as(o)这种结构也可用不定式作状语 Be so kind as to drop in some time when you are free. b)如果要说明不定是表示的动作是谁做的,可以在不定式前加一个for引起的短语 It is not hard for one to do a bit of good It is a great honour for us to be present at this rally 在以某些形容词(如kind,good,nice,wise, unwise, clever,sily, wrong,rght, foolish, stupid, careless; considerate,rude, naughty., impolite等)作表语时,不定式前可加一个of引起的短语,来说 明不定式指的是谁的情况 It's kind of you to think so much of us AnthonyHoEmail:anthonyho@citiz.net 大学英语四级语法精要 Page 7 of 24Anthony Ho Email: anthonyho@citiz.net 大学英语四级语法精要 Page 7 of 24 e) 在介词 except, but 之后, 如果其前有动词 do 的某种形式, 不定式一般不带 to, 反之带 to. There is nothing to do except wait till it stops raining. Smith will do anything but work on a farm. There’s no choice but to wait till it stops raining. f) 连词 rather than, sooner than 置于句首时, 其后的不定式不带 to. Rather than push the book back as he wanted to do, he forced himself to pick it up. 出现在句中其他位置时, 其后的不定式有时带 to, 有时不带 to. He decided to write rather than telephone. The manager believes it is important to invest in new machinery rather than to increase wages. g) 用作补语的动词不定式, 如果主语是由“all + 关系分句”，“thing +关系分句”，“what 分句” 或“thing +不定式结构”等构成，并带有 do 的某种形式，这时，作为主语补语的不定式可 以省 to，也可以不省. What he will do is (to) spoil the whole thing. All you do now is complete the form The only thing I can do now is go on by myself. The thing to do now is clear up this mess. The least I can do is drive everybody else closer to the issue. 4) 不定式的其他用法 a) too…to 结构通常表示否定意义: She was too young to understand all that. enough…to 结构则表示肯定意义: She was not old enough to understand all that. not too, but too, all too, only too 等和不定式连用时,不定式一般不表示否定意义: He’s only too pleased to help her. so…as (to)这种结构也可用不定式作状语: Be so kind as to drop in some time when you are free. b) 如果要说明不定是表示的动作是谁做的, 可以在不定式前加一个 for 引起的短语: It is not hard for one to do a bit of good. It is a great honour for us to be present at this rally. 在以某些形容词(如 kind, good, nice, wise, unwise, clever, silly, wrong, right, foolish, stupid, careless, considerate, rude, naughty, impolite 等)作表语时, 不定式前可加一个 of 引起的短语, 来说 明不定式指的是谁的情况: It’s kind of you to think so much of us