All are fine. #s 1 and 3 are most commonly used, but all are correct.
That "It" in 1 and 2 is that impersonal "it" that doesn't refer to anything. It's just a way to introduce a sentence, just as "There" is in 3 and 4.
1. It's no use worrying about it.
2. It's no use to worry about it.
3. There is no use worrying about it.
4. There is no use to worry about it.
Which ones are grammatical? In #1 and #2, does 'it' on the left refer to 'worrying about it'?
2 answers
It is no use being worried.Is it correct?