Question

one和it用法的区别是什么？

Answer 1

one是不定代词，只表示数量为一的单数名词，而没有限定，而代词it表示有限定意义的名词。另外，one可以加修饰语，而it不可以，如：

I'd like to borrow a hammer if you have one.

Did you bring the textbook?

No, I didn't bring it.

I lost my mobile hard disk yesterday, so I have to buy a new one.

These boots have worn out. I have to buy some new ones.

I like that picture--I mean the third one from the left.

The guitar is similar to the one that I have.