Yes. If used as an inquiry then the first letter should be capitalised and it should end with a question mark.
No, "where are they" is not grammatically correct. It should be "Where are they?" with a question mark at the end.
Yes it is a grammatically correct
The phrase "You are not knowing" is not grammatically correct. Instead, you can use "You do not know" or "You are not aware."
'Rhoda's crazy' 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.
Saying, "I am annoyed of the way you behave.", is grammatically correct.
I don't understand the question. Perhaps you mean; "Is anyone capable of writing a coherent, intelligible and grammatically-correct question?"
It is what you will hear in informal speech, but is not correct for formal writing. Try: "That is the girl.", "That is the woman.", "That is my sister.", "That is my wife.", etc. The grammatically correct form of the sentence 'That is her' is 'That is she.'
Yes, but it is very informal - that is not suitable for writing.
Yes, it is grammatically correct; when used, it is followed by a comma. However, it is often overused in writing and shouldn't be used in excess.
"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.
The phrase "You are not knowing" is not grammatically correct. Instead, you can use "You do not know" or "You are not aware."
"You are" is present tense, happening now,, while "sat" is past tense. so this sentence doesn't work. :" You are sitting writing this," although awkward is correct.
Typically it's not grammatically correct to do so. It depends on the context of what you are writing though.
"That was wrong" is a grammatically correct sentence.