Add question tags to the following sentences: 15. Donald didn't forget your birthday.
16. I don't need your help..
17. They are playing chess,
18. Andy can't speak Italian,.
19. Brian is American
20. You don't know Betty.
21. It's an exciting job,
22. He won't send me a postcard
23. We are in front of his house,
24. Lola lost her glasses yesterday,
25. You've got a polaroid camera
26. I'm late,
27. Bob's absent,
28. George doesn't drink tea,
29. We're happy.
30. He comes from Italy.