posted by rfvv today at 8:58am.

Question

1. You need not have done it.
2. You need have done it.
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Are they all grammatical?
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Engish - Writeacher today at 9:05am
1 is okay, but 2 is not.

2 could be rephrased like this ~~> You need to have done it.

1 could also be rephrased like this ~~> You do not need to have done it.
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(Thank you. You mean that #2 is ungrammatical, right? What about the following? Is it okay?)

3. Need you have done it?

Answer 1

In formal British English, 3 would ptobably be used. In American English, I'd say, "Did you need to do that?"

Answer 2

... probably ...