Both are correct, although forward and backward are the preferred forms.
Both "forward and backward" and "forwards and backwards" are grammatically correct. "Forward and backward" is more commonly used in American English, while "forwards and backwards" is more commonly used in British English.
Both "I take a step forward" and "I take a step forwards" are grammatically correct, but "I take a step forward" is more commonly used in American English. In British English, both "forward" and "forwards" are accepted, but "forwards" may sound more formal.
The phrase "You are not knowing" is not grammatically correct. Instead, you can use "You do not know" or "You are not aware."
Yes, "He sailed his boat on the river" 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.
No, it is not grammatically correct. The correct way to say it is "your older sister."
I fell backward. Is the correct sentence I belive.
Both "I take a step forward" and "I take a step forwards" are grammatically correct, but "I take a step forward" is more commonly used in American English. In British English, both "forward" and "forwards" are accepted, but "forwards" may sound more formal.
"Not like that" can be grammatically correct, depending on the context.
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."
"That was wrong" is a grammatically correct sentence.
Yes, it is grammatically correct.
Yes, Almighty God is grammatically correct.
'What a drunkard you are' is a grammatically correct English sentence.
Yes, "He sailed his boat on the river" 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.