it的用法,From my Mum's love and patience,I learned that what a huge responsibility ) was to raise a child为什么填it?

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it的用法,From my Mum's love and patience,I learned that what a huge responsibility ) was to raise a child为什么填it?

it的用法,From my Mum's love and patience,I learned that what a huge responsibility ) was to raise a child为什么填it?
it的用法,
From my Mum's love and patience,I learned that what a huge responsibility ) was to raise a child
为什么填it?

it的用法,From my Mum's love and patience,I learned that what a huge responsibility ) was to raise a child为什么填it?
宾语从句还原是这样的
It was a huge responsibility to raise a child
可见it 是形式主语
由于引导宾语从句的what修饰a huge responsibility 而把这个名词词组前置了

it 是形式主语,原句是to raise a child is a huge responsibility
再变成 what a huge responsibility it is to raise a child!是感叹句
不懂继续追问,望采纳,谢谢。(*^__^*) 嘻嘻