The sentence is gramatically correct.
yes.
Everybody has is correct.
Yes it is.
No 'It's for you' would be though
It's a weird sentence, but it is grammatically correct.
Yes it is correct to say "Have a wonderful Holiday."
i welcome you TO Delhi.
No because and is a fanboy and it would not be gramatically correct
Yes, there is a verb and and a noun and they are in the same tense therefore it is gramatically correct.
You should say for your convenience it is *gramatically correct-*just means correct
Yes.