You could use either of those phrases.
Yes, both "joyful time" and "joyous time" are grammatically correct and can be used interchangeably to convey a time filled with joy and happiness.
No, the sentence is not grammatically correct. It should be: "It had been a long time since I had written to you."
It is grammatically correct to say it is the time for someone and not it is the time of someone.
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 would not be a complete sentence but, there is nothing inherently grammatically incorrect in the phrase "during the all period". What you have is a reference to a period of time called "the all". Just because nobody knows what "The All" is doesn't make this grammatically incorrect.
Yes, that phrase is grammatically correct and conveys the message effectively. It means that currently, there are no issues or worries that have been identified.
No, the sentence is not grammatically correct. It should be: "It had been a long time since I had written to you."
No, the word 'joyful' is an adjective. An adjective that follows a linking verb and renames or modifies a subject is called a predicate adjective.Example: Mary is joyful about the news.A predicate noun is a noun or a pronoun that follows a linking verb and renames or modifies a subject.Example: Mary is my sister.Both a predicate noun and a predicate adjective are called a subject complement.
As time flies is grammatically correct.
no.
It is grammatically correct to say it is the time for someone and not it is the time of someone.
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?
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.
Unless you hurry, you will not be able to reach school in time.
Yes, but whether it means anything is unclear. A sentence may be grammatically correct and total gibberish at the same time.