She lost a lot of money.I didn't know how she did so.为什么去掉so?

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She lost a lot of money.I didn't know how she did so.为什么去掉so?
She lost a lot of money.I didn't know how she did so.为什么去掉so?

She lost a lot of money.I didn't know how she did so.为什么去掉so?
最根本的,有了助动词,就没有so.有了so,就没有助动词
1 前面有了上文(She lost a lot of money),後面的下文(did== She lost a lot of money)存在了,就可以省略(尽管可以不省略).如果省略了,句子就显得精炼到位.
2 但下面的句子裏面,so不能省略:
- Will John come tomorrow
- Well,I'm afraid not,but I hope so.(so==John will come tomorrow)
同样,也省略so,因为有了助动词:
---------Will John come tomorrow
-------- I hope he will.
3 又如:
A:Does Tom live there?
B:I am sure he does(==he lives there).--------所以,不必说:I am sure he does so.
请认真研读这些句子吧.