Unless you hurry, you will not be able to reach school in time.
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.
yes
It can be, but not all the time.
No, I think the correct way is- Is this the first time you've seen it?
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.
Yes, the phrase "I came home at about one o'clock" is grammatically correct. It follows a subject-verb-object structure and conveys a clear message about the time of arrival.
It is grammatically correct to say it is the time for someone and not it is the time of someone.
The correct grammar is YOU AND I if used as a subject, e.g. ""You & I will have a jolly good time". Correct grammar requires YOU AND ME if used as an object, e.g. "This is just between you and me" "I" designates a subject and "me" designates an object.