Question

it的用法，在线等

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

Answer 1

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

Answer 2

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