If the 'hr' is referring to the word 'hour' then yes, it is grammatically correct. When deciding whether to use 'A' or 'An', it depends on the pronunciation, not the letter used. In the word 'hour' you do not pronounce the 'h', so it sounds like it starts with an 'o', so you would use 'an'.
The abbreviation 'an hr' is not grammatically correct. It should be written 'an hour/An hour'. Sometimes 1hr or 2hrs is okay depends on the situation.
This is not grammatically correct. The correct form is 'you do not know', or the abbreviated 'you don't know'.
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."
Saying, "I am annoyed of the way you behave.", is grammatically correct.
"Not like that" can be grammatically correct, depending on the context.
Yes! That is grammatically correct!
Yes, 'for free', 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, Almighty God is grammatically correct.
Yes, it 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."
Saying, "I am annoyed of the way you behave.", is grammatically correct.