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She doesn't think so or you don't think so?

Is it grammatically correct to respond with




to this question?

Or does this depend on the meaning intended to be conveyed with the answer?

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'Colorless green ideas sleep furiously' is grammatically correct, but rarely a logical, helpful or polite thing to say. – Edwin Ashworth Apr 24 '13 at 21:26
It's grammatically correct to respond with either or neither. Which you choose depends on which is actually correct in the circumstances. – Andrew Leach Apr 24 '13 at 21:32
Answering "neither" to negative questions is not something I would recommend doing. "We have too much work today. Would you rather have no breakfast or no lunch." "Neither." Does that mean "I want both breakfast and lunch" or "I don't want either breakfast or lunch"? But it's not the same as "Either," which means "I don't care which meal we skip. – Peter Shor Apr 24 '13 at 21:45

Update: I don't know any more. It's just too confusing!

Old Post:

In this example, both can be used:

Neither => "neither one of those options is true".

Either => "one of those options is true; it doesn't matter which one you pick".

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Of course, in OP's exact context, it could just as well mean "Both of those options are true; Neither she nor I think so. – FumbleFingers Apr 24 '13 at 21:38
Or indeed, that neither of the options is true, and they both think so. – Andrew Leach Apr 24 '13 at 21:52
@FumbleFingers: Err that's true. Argh. – Cerberus Apr 24 '13 at 22:58

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