I don't think its a good idea to copg other's homeworR.为什么用it's而不用that's

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I don't think its a good idea to copg other's homeworR.为什么用it's而不用that's
I don't think its a good idea to copg other's homeworR.为什么用it's而不用that's

I don't think its a good idea to copg other's homeworR.为什么用it's而不用that's
我刚刚回答的不行么 - -
此处可以直接说 I don't think copying other's homework is a good idea.
但是 copying other's homework 整个做主语未免显得冗杂
所以需要形式主语来代替
it此处做形式主语,代替copy other's homework
that不行.没有用that 做形式主语的用法..
这样行么?

it是虚拟主语,真正的主语是to copg other's homeworR(应该是copy ...homework)