My company has entered into.....
Group of companies is grammatically correct.
The correct phrase is "went out with the company of your friends." This construction conveys the idea that the friends accompanied you.
If you use "with" it indicates there's a company of friends and you went with them. If you use "in" it indicates you are part of the company.
"Not like that" can be grammatically correct, depending on the context.
Yes, 'for free', is grammatically correct.
Yes! That 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."
Yes, it is grammatically correct.
Yes, Almighty God is grammatically correct.
"That was wrong" is a grammatically correct sentence.
'What a drunkard you are' is a grammatically correct English sentence.
Yes, "He sailed his boat on the river" is grammatically correct.