判断语法正误She found it difficult to convince him.如果改成She found difficult to convince him.

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判断语法正误
She found it difficult to convince him.
如果改成She found difficult to convince him.

it 在本句中是形式宾语,真正的宾语是不定式to convince him.
改成后面说的不对

不对。。本句话是it做形式宾语。to convince做真正主语

it做形式宾语，代替真正宾语:to convince him
当宾语是不定词或名词子句时，因为宾语过长，常用形式宾语it代替，写成Vt+it+形容词+ 不定词或名词子句，来使句子显得更加工整。比如:
[He made it clear what he intended to do.] 或[He made what he intended to do clear.]
[i ...

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it做形式宾语，代替真正宾语:to convince him
当宾语是不定词或名词子句时，因为宾语过长，常用形式宾语it代替，写成Vt+it+形容词+ 不定词或名词子句，来使句子显得更加工整。比如:
[He made it clear what he intended to do.] 或[He made what he intended to do clear.]
[i find it hard to keep a dog.]或[i find to keep a dog hard.]
在这里it是做found的形式宾语
find 后面的to convince him太长
因此用it来做found的形式宾语
于是有了Sb find it adj to do sth的固定句型
希望能帮到你 O(∩_∩)O~

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你改的那个不对，没有这种语法。为了避免头重脚轻，所以才用it代表形式宾语，真正的宾语也就是to convince him放在了后面，这是很基本的，记住就行了

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