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Evelyn: I need you!
Sam: So do I!

Is this grammatical? What is the meaning of the response?

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Yes. Need can be not only a modal, but also a common verb. – Stan May 28 '13 at 8:49

That conversation is perfectly grammatical. So do I shows an agreement with what the previous person said. In this case, the conversation would be equivalent to:

Evelyn: I need you!
Sam: I need you too!

It would be overly pedantic indeed to infer that the second person is saying I need myself too.

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