6. Will you go - will have.
(Thì TLĐ.)
7. is your brother doing - is practicing.
(Thì HTTD).
-listens - does.
(Thì HTĐ)
8. left.
(Thì QKĐ.)
has taught.
(Thì HTHT).
9. had - went.
(Thì QKĐ.)
10. went.
(Thì QKĐ.)
11. have just left - have not seen.
(Thì HTHT.)
12. have not never seen.
(Thì HTHT.)
visited.
(Thì QKĐ.)
13. finished.
(Thì QKĐ.)
14. left/went.
(Thì QKĐ.)
15. have not never seen.
(Thì HTHT.)
visited.
(Thì QKĐ.)
16. got - Had overflowed.