Tag questions

Add the tags, pay attention to spelling and apostrophes. 1. I'm late, aren't I?2. They're waiting, aren't they?3. He's left, hasn't he?4. It works, doesn't it?5. I've finished, haven't I?6. You like it, don't you?7. You can see him, can't you?8. I'm not late, am I?9. He isn't leaving, is he?10. He hasn't finished, has he?11. Joe is keen on sport, isn't he?12. Maria hasn’t forgotten about the meeting, has she?13. We shouldn’t enter this room, should we?14. There weren’t having any problems, were they?15. I lost my key, didn't I?16. You didn’t apologise to Frank, did you?17. I had remembered to book the tickets, hadn'tI?18. He wasn't in my room, was he?19. She will come at 6, won't she?20. He had to do his exercise, didn't he?