it is...for sb.to do...和it is...of sb.to do...的用法

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it is...for sb.to do...和it is...of sb.to do...的用法

it is...for sb.to do...和it is...of sb.to do...的用法
it is...for sb.to do...和it is...of sb.to do...的用法

it is...for sb.to do...和it is...of sb.to do...的用法
给您介绍一个最简单的辨别方法:如果be动词后的形容词是说明不定式的逻辑主语,就用of sb.to do...;如果是说明整个不定式的,则用 for sb.to do...;例如:
1、It is very kind of you to help us.(可以转换成:You are very kind to help us.kind
说明 you 的属性);
2、It is possible for us to get there before dark.(不可转换成:we are possible...,而应该是 for us to get there is possible)

for限制于 of属于
如果是人的自然属性,就用of,比如kind,cruel,stupid,clever,nice,bad,
如果不是,就用for,比如important,necessary,hard,easy,