It is correct if you wish to ask someone how they came to know you. You could also ask "Where did we meet" or "How do we know each other?"
He, you and I is not grammatically correct. The proper way to say this is you, him and I.
Yes, soonest is correct grammatically.
Currently we have is grammatically correct.
Yes, it is grammatically correct.
"That was wrong" is a grammatically correct sentence.
This is not grammatically correct. The correct form is 'you do not know', or the abbreviated 'you don't know'.
'She does not have her book' is grammatically correct.
He, you and I is not grammatically correct. The proper way to say this is you, him and I.
Yes, soonest is correct grammatically.
"Not like that" can be grammatically correct, depending on the context.
Yes! That is grammatically correct!
Yes, 'for free', is grammatically correct.
Yes it is a grammatically correct
Currently we have is grammatically correct.
your question isn't grammatically correct or coherent.
Yes, it is grammatically correct.
'Rhoda's crazy' is grammatically correct.