23. What will Nam do when he __________ school next year?
A. could finish B. will finish C. has finished D. finishes
24. I ____________in Hanoi before I moved to HCM City.
A. had been living B. had lived
 C. have lived D. have been living
25. When I was a boy, I _____________tea to coffee.
A. preferred B. was preferring C. have preferred D. prefer 

26. He went back to work in his country after he ________his course on Advanced Engineering
in London.
A. was finishing B. finishes C. has finished D. had finished
27. He __________up his mind yet.
A. hasn't made B. didn't make C. wasn't making D. wasn't make
28. I ______ TV while my father ______ a newspaper last night.
A. am watching / was reading B. was watching / was reading
C. am watching / is reading D. was watching / is reading

`23.` D

`->` Câu điều kiện loại 1 diễn tả một hành động/sự việc có thể xảy ra trong tương lai

`->` If + S + V-s/es, S + will/modal verbs + V-bare + O

`24.` B

`->` Before + QKĐ, QKHT

`->` QKĐ: S + V2/ed + O

`->` QKHT: S + had + VpII

`25.` A

`->` When + S + V2, S + V2 + O

`->` prefer + to VN: thích làm gì hơn/cái gì hơn

`26.` D

`->` After + QKHT, QKĐ

`->` QKĐ: S + V2/ed + O

`->` QKHT: S + had + VpII

`27.` A

`->` yet `->` HTHT

`->` S + have/has + VpII

`->` make up one's mind (phr): quyết định

`28.` B

`->` Diễn tả hai hành động xảy ra song song trong quá khứ

`=>` While + S + was/were + V-ing, S + was/were + V-ing

`

`23` `D` .

`-` S + will + V-inf + O + when + S + V(s,es) + O : Ai đó sẽ làm gì khi mà ai đó làm gì.

`24` `B`.

`-` before + mệnh đê quá khứ đơn : DHNB thì quá khứ hoàn thành.

`=>` Form : S + had + V3/Vpp + O.

`25` `A`.

`-` Quá khứ đơn : S + V(quá khứ) + O.

`26` `D` .

`-` Trước ''after'' là một mệnh đề thì quá khứ đơn : DHNB thì quá khứ hoàn thành.

`=>` Form : S + had + V3/Vpp + O.

`27` `A`.

`-` yet : DHNB thì HTHT.

`=>` Form : S + have/has + not + V3/Vpp + O.

`28` `B`.

`-` Cả hai hành động song song đang xảy ra trong quá khứ.

`=>` Form : S + was/were + V-ing + O.