Most of the time it is not because people like to be quick and insted of saying 'are' they would say 'R'.
"Not like that" can be grammatically correct, depending on the context.
Yes, 'for free', is grammatically correct.
Yes! That is grammatically correct!
Yes it is a grammatically correct
This is not grammatically correct. The correct form is 'you do not know', or the abbreviated 'you don't know'.
Yes, it is grammatically correct.
Yes, Almighty God is grammatically correct.
"That was wrong" is a grammatically correct sentence.
'Rhoda's crazy' is grammatically correct.
'What a drunkard you are' is a grammatically correct English sentence.
"For free' is grammatically correct. It is an idiom of the English language.
The sentence is grammatically correct.