It depends on the context you are using it in.
Example: In class we had to tap our foot in time to the beat.
I had to skip breakfast in order to be on time for work.
As time flies is grammatically correct.
Yes, it is grammatically correct.
Yes, Almighty God is grammatically correct.
"That was wrong" is a grammatically correct sentence.
This sentence is grammatically correct.
No, the sentence is not grammatically correct. It should be: "It had been a long time since I had written to you."
Yes, it is grammatically correct to say "this date and time is good for me" when referring to a specific date and time that works for you.
As time flies is grammatically correct.
no.
It can be, but not all the time.
yes
No, I think the correct way is- Is this the first time you've seen it?
"Not like that" can be grammatically correct, depending on the context.
Yes! That is grammatically correct!
Yes, 'for free', is grammatically correct.
Yes, both "joyful time" and "joyous time" are grammatically correct and can be used interchangeably to convey a time filled with joy and happiness.
That sentence is grammatically correct.