They came back home after they (finish) _________their work.
A. finished
B. had finished
C. had been finished
D. had finish
Ta thấy trong câu có 2 sự việc xảy ra trong quá khứ và có một sự việc được hoàn thành trước một sự việc khác. Mệnh đề ngay sau after sẽ chia thì quá khứ hoàn thành (vì đây là sự việc xảy ra trước), mệnh đề còn lại chia thì quá khứ đơn.
Cấu trúc: After + S + had Ved, S + Vqkd
=>They came back home after they had finished their work.
Tạm dịch: Họ trở về nhà sau khi họ hoàn thành công việc.
Đáp án cần chọn là: B
Frank Sinatra caught the flu because he (sing)__________ in the rain too long.
How long (learn / she)_________ English before she went to London?
He (drive) __________less than an hour when he ran out of petrol.
One of the parents _____________ the children's song this time last year.
I ______ my document before the power went out in the computer lab.
As soon as I shut the front door I realised that I………….my key in the house.
Marry _________ her housework already by the time Peter came over.
The doctor took off the plaster that he (put on)_________ six weeks before.