I believe it should be
It is your's and John's business.
Or
It is John's and your business.
Something of the sort, but I don't think what you said is terribly incorrect either.
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If you're looking for the grammatically correct way of asking the above question it's 'Are you in an office ?'
The correct spelling is "business"
The correct spelling is business.
e-business is the correct answer
The way you said that is grammatically correct if that's what you were asking.
Yes, 'for free', is grammatically correct.
"Not like that" can be grammatically correct, depending on the context.
Yes! That is grammatically correct!
This is not grammatically correct. The correct form is 'you do not know', or the abbreviated 'you don't know'.
'What a drunkard you are' is a grammatically correct English sentence.
"That was wrong" is a grammatically correct sentence.
Yes, it is grammatically correct.
Yes, Almighty God is grammatically correct.
Sure. It would also be grammatically correct to write He spoggled his nubbix on the goober. Grammatically correct and meaningful are not the same.
The phrase "Is you don't miss me do you" is not grammatically correct. It should be rephrased to something like "Don't you miss me?" to be correct.
No, it is not grammatically correct. The correct way to say it is "your older sister."