`17. C`

`-` before 1975 `->` QKHT

`18. B`

`-` already `->` HTHT

`19. B`

`-` next month `->` TLĐ

`20. A`

`21. D`

`-` this time next Monday `->` TLTD

`22. C`

`23. D`

`24. B`

`25. C`

`26. D`

`27. D`

`-` for ages and ages `->` HTHT

`28. B`

`-` by next June `->` TLĐ

`29. A`

`@` TLĐ + as soon as + HTĐ/HTHT

`30. A`

`@` QKĐ + as soon as + QKĐ/QKHT

`31. D`

`32. A`

`@` Before + HTĐ + TLĐ

`33. C`

`34. D`

`35. A`

`----------`

`@` While + QKTD + QKTD

`->` Hai hành động diễn ra song song trong qk

`@` When + HTĐ + TLĐ

`->` hành động xảy ra sau một hành động khác

`@` While/when  + QKTD + QKĐ

`-` Hành động đang xảy ra : QKTD 

`-` Hành động xen vào : QKĐ 

`----------`

`@` QKĐ :

`-` Be :

(+) S + was/ were + O

(-) S + was/ were + not + O

(?) Was/Were + S + N/Adj ?

`-` V :

(+) S + V_ed/2 + O

(-) S + did not + V_inf + O

(?) Did (not) + S + V_inf + O ?

`***` Wh-word + did + S + V_inf ?

`-` DHNB : esterday, ago , last night/ last week/ last month/ last year, ago(cách đây), when.

`@@@`

`@` QKTD : 

(+) S + was/were + V_ing + O

(-) S + was/were+ not + V_ing + O

(?) Was/were+S+ V_ing + O ?

`-` DHNB : time cụ thể, At + thời gian quá khứ, At this time + thời gian quá khứ, In + năm trong quá khứ, in the past

`@@@`

`@` HTHT : 

(+) S + have/ has + V_ed/3+ O

(-) S + have/ has+ NOT + V_ed/3+ O

(?) Have/ has + S+ V_ed/3+ O ?

`-` DHNB : Already, not…yet, just, ever, never, since, for, recently, before…

`@@@`

`@` HTHTTD : 

(+) S + have/ has + been + V_ing + O

(-) S + haven’t/ hasn’t + been + V-ing

(?) Have/ Has + S + been + V-ing ?

`-` DHNB : All day, all week, since, for, for a long time, in the past week, recently, lately, up until now, and so far, almost every day this week, in recent years.

`@@@`

`@` QKHT : 

(+) S + had + V_ed/3 + O

(-) S + had+ not + V_ed/3 + O

(?) Had +S + V_ed/3 + O ?

`-` DHNB : After, before, as soon as, by the time, when, already, just, since, for….

`-` DHNB : After, before, as soon as, by the time, when, already, just, since, for….

`@@@`

`@` QKHTTD : 

(+) S + had + been + V-ing + O

(-) S + had+ not + been + V-ing

(?) Had + S + been + V-ing ?

`-` DHNB : Until then, by the time, prior to that time, before, after.

`@@@`

`@` TLĐ : 

(+) S + shall/will + V_inf + O

(-) S + shall/will + not + V_inf + O                                                  

(?) Shall/will+S + V_inf + O ?

`-` DHNB : tomorrow, Next day/ Next week/ next month/ next year, in + thời gian…