=>
14. stayed
-> when my parents were on holiday (sự việc đã xảy ra trong quá khứ -> QKĐ)
15. haven't seen/hasn't visited
-> for/since (thì HTHT, S have/has (not) V3/ed)
16. has been
-> twice (HTHT)
17. has worked
-> for two years (HTHT)
18. moved/have been
-> in 2001 (QKĐ, S V2/ed)
-> a long time now (HTHT)
19. wore
-> It was so...that S V2/ed
22. has become
-> in the past few years (HTHT)
23. have felt/lived
-> HTHT since QKĐ