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4) 不定式的其他用法
a) too…to 結構通常表示否定意義:
She was too young to understand all that.
enough…to結構則表示肯定意義:
She was not old enough to understand all that.
not too, but too, all too, only too等和不定式連用時,不定式一般不表示否定意義:
He’s only too pleased to help her.
so…as (to)這種結構也可用不定式作狀語:
Be so kind as to drop in some time when you are free.
b) 如果要說明不定是表示的動作是誰做的, 可以在不定式前加一個for引起的短語:
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.
在以某些形容詞(如 kind, good, nice, wise, unwise, clever, silly, wrong, right, foolish, stupid, careless, considerate, rude, naughty, impolite等)作表語時, 不定式前可加一個of引起的短語, 來說明不定式指的是誰的情況:
It’s kind of you to think so much of us.
(It is) Awfully good of you to come and meet us.
It’s very nice of you to be so considerate.
It’s unwise of them to turn down the proposal.
