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.
"Not like that" can be grammatically correct, depending on the context.
Yes, 'for free', is grammatically correct.
Yes! That is grammatically correct!
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.
The phrase "You are not knowing" is not grammatically correct. Instead, you can use "You do not know" or "You are not aware."
Yes, it is grammatically correct.
Yes, Almighty God is grammatically correct.
"That was wrong" is a grammatically correct sentence.
The sentence "Rhoda's Crazy" is not grammatically correct. It is missing a verb to make a complete sentence.
'What a drunkard you are' is a grammatically correct English sentence.
"For free' is grammatically correct. It is an idiom of the English language.