11. witnessed (hành động xen vào)
12. to book (plan to V)/ to be examined (bị động need to be Vpp)
13. will be evacuating (At this time tomorrow `->` Chia thì TLTD)
14. listening (spend V-ing)
15. explaining (not mind V-ing)
16. stealing (deny V-ing)
17. was teaching (At 8 o’clock last night `->` Chia thì QKTD)
18. broke/ was cooking
19. will be teaching (At 1 pm this Thursday `->` Chia thì TLTD)
20. wasn't learning (Between 8:30 and 9:00 last night `->` Chia thì QKTD)