18. When we arrived home last night, everybody ___________ .
 A. has already slept B. had already slept
 C. was already sleeping D. already sleeping
19. Mark Twain _________ loved his wife before he met her.
A. is B. was C. has D. had
20. How __________ since we left school?
A. will you B. have you been C. are you D. are you being
21. They _________ a presentation at this time tomorrow morning.
 A. are making B. are going to make C. will be making D. will making
22. Mary ____________ an hour ago.
A. don't see B. hadn't seen C. didn't see D. haven't seen

`18` `B` .

`-` already + hành động xảy ra trước hành động nào đó trong quá khứ : Thì quá khứ hoàn thành .

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

`19` `D` .

`-` S + had + V3/Vpp + O + before + S + V(quá khứ) + O: Ai đó đã làm gì trước khi ai đó làm gì.

`20` `B` .

`-` since + mệnh đề quá khứ đơn : DHNB thì HTHT.

`=>` Form : Wh-question + have/has + S + V3/Vpp + O `?`

`21` `C`.

`-` at this time tomorrow : DHNB thì tương lai tiếp diễn.

`->` Form : S + will be + V-ing + O.

`22` `C`.

`-` an hour ago : DHNB thì quá khứ đơn.

`=>` Form : S + didn't + V-inf + O.

18. When we arrived home last night, everybody ___________ .  A. has already slept B. had already slept  C. was already sleeping D. already sleeping ( sau when chia QKD , còn lại chia QKHT )

19. Mark Twain _________ loved his wife before he met her. A. is B. was C. has D. had(sau before chia QKD , còn lại chia QKHT )
 
20. How __________ since we left school? A. will you B. have you been C. are you D. are you being ( "since" dấu hiệu thì HTHT ) 

21. They _________ a presentation at this time tomorrow morning.  A. are making B. are going to make C. will be making D. will making("at this time tomorrow" dấu hiệu của thì TLTD )

22. Mary ____________ an hour ago. A. don't see B. hadn't seen C. didn't see D. haven't seen ( có từ "hour ago " dấu hiện nhận biết thì QKD )
 xin câu trl hay nhất ạ