Mary and we. If Mary was not involved you wouldn't say "us" (i.e. "us like to go shopping").
Yes, "she treated us to a great dinner" is grammatically correct English.
"That was wrong" is a grammatically correct sentence.
Yes, it is grammatically correct.
Yes, Almighty God is grammatically correct.
This sentence is grammatically correct.
Yes, very!
The sentence "Is Mary not Happy" is correct grammatically as a question. It defines Mary as the subject and not happy as the object. In the other sentence, though grammatically correct, it could be confusing. Not Mary could be construed as all people but Mary. I would use the first sentence, as it is clearest.
It is grammatically correct, but not good English because things cannot be in despair. Use "desperate."
"Send your response to Mary and me" is correct.It is always incorrect to say "to Mary and I" in any context.The easiest way to keep track is to substitute "we" or "us" for "Mary and I/me." "Mary and I" is equivalent to "we"; "Mary and me" is equivalent to "us."We went to the store ⇒ Mary and I went to the store.Send it to us ⇒ Send it to Mary and me.That will guide you naturally to the correct selection, except in the case of predicate nominatives. For example, "It is we" is grammatically correct, so you would substitute "It is Mary and I," but most people think either of those sounds odd.
"Not like that" can be grammatically correct, depending on the context.
Yes it is a grammatically correct
Yes! That is grammatically correct!
Yes, 'for free', is grammatically correct.
Yes, "she treated us to a great dinner" is grammatically correct English.
The phrase "You are not knowing" is not grammatically correct. Instead, you can use "You do not know" or "You are not aware."
"That was wrong" is a grammatically correct sentence.
Yes, it is grammatically correct.