19. ……… he free all day? are is am was were be 20. ………you at Nina’s house? are is am was were be 21. I…………with him. are is am was were be 22. …………..they happy? are is am was were be 24. ........... you busy today? - Yes, I…………… are - are is - is am - are are - am were - was be 25. ………. it cold? - No, it……………. are - aren't is - isn't am - am not was - wasn't were be 26. Where…………… they on Sunday? - They…………. at the store. are - are is - is am - am was - was were - were be - be 27. …………Nina and Sam strong? - No, they……………… are - are is - isn't am - am not are - aren't were - weren't be – be 28. ………….Sam ill? - Yes, she………………… are - are is - is am - am was - was were - were be – be 32. I ……………………… at home now. are is am was were be Chọn đáp án đúng