tara超新星:----Do you think Tom will be late for the train?——---------。为什么填I hope not

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为什么不填I don‘t hope so?

Do you think
只是起辅助作用
应该以Tom will be late for the train为重点的!

----Do you think Tom will be late for the train?
----I hope not。
是交际用语类惯用法。
如: think---- I think so. I don't think so.
believe---- I believe so. I don't believe so.
suppose---- I suppose so. I don't suppose so.
而: hope---- I hope so. I hope not.
afraid ---- I'm afraid so. I'm afraid not.

don't 是助动词,句中要有助动词才行

记得中学参考书是说只能用Ihope not的
应该也属于习惯用法类吧

习惯用法
I don't hope so很蹩脚,虽然语法上没有问题.

I hope not . I don't think so .习惯用法