it +形容词+to do sth 和it is +形容词+to do sth 有什么区别?

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it +形容词+to do sth 和it is +形容词+to do sth 有什么区别?
it +形容词+to do sth 和it is +形容词+to do sth 有什么区别?

it +形容词+to do sth 和it is +形容词+to do sth 有什么区别?
It’s + adj.+ (of / for) sb to do sth.译作“(某人)做某事是…的”.It 是形式主语,不定式结构是真正主语.of / for后面的sb是不定式的逻辑主语.
1.当形容词是可修饰人的形容词,即sb和adj.有主系表关系时,sb前用of.如 It’s clever of you to answer the question so quickly./ It’s kind of you to help me a lot.这样的形容词有:kind,nice,rude,clever,silly,foolish等.
2.当形容词是不可以修饰人的形容词,即sb和adj.没有主系表关系时,sb前用for.如 It’s easy for her to clean the window by herself./ It’s important for us to learn English well.这样的形容词有:easy,hard,difficult,important,necessary,dangerous等.

前一句的 it 前面还要加一个动词 如 I find it easy to learn English.

it+形容词+to do 中的it是形式宾语,而adj.做宾语补足语,to do sth是真正的宾语。例如,I found it hard to solve this problem
it is+ 形容词+to do 中的it 是形式主语。例如,It is easy to get along with her. 如果在宾语从句中应该表达成 I found (that) it is easy...

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it+形容词+to do 中的it是形式宾语,而adj.做宾语补足语,to do sth是真正的宾语。例如,I found it hard to solve this problem
it is+ 形容词+to do 中的it 是形式主语。例如,It is easy to get along with her. 如果在宾语从句中应该表达成 I found (that) it is easy to get along with her=I found it easy to get along with her.

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