What date is Parents' Day?
It is May 8th.
What day is Parents' Day?
It is Monday.
Are each answer and question grammatical?
3 answers
Yes. They are all grammatical.
However your question does not have a subject and verb that "agree". Can you figure out what the problem is?
Are each answer and question grammatical?
Are each answer and question grammatical?
Ooops! I didn't see that one. Good catch, Guru.