大学英语四级语法精要 不定式的其他用法

大学英语四级语法精要不定式的其他用法

不定式的其他用法

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.

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.

(it is) awfully good of you to e and meet us.

it’s very nice of you to be so considerate.

it’s unwise of them to turn down the proposal.

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