English clauses always have a subject:
His father has just retired. Was a teacher. > He was a teacher.
I’m waiting for my wife. Is late. > She is late.
Look at the time! Is half past two.> It’s half past two.
- See more at: http://learnenglish.britishcouncil.org/en/english-grammar/pronouns/it-and-there#sthash.7MJGh8lr.dpuf