Đáp án:
9. Has the meeting been postponded by the council?
(vì đây là thì câu hỏi HTHT ở passive voice nên have/ has + S + been + V3 (+ by Sb/ O))
10. The room was being cleaned when I arrived.
(vì đây là thì QKTD ở passive voice nên S + was/ were + being + V3 (+ by Sb/ O))
11. Our homework hasn't been finished yet.
(vì đây là thì HTHT ở passive voice nên S + have/ has + been + V3 (+ by Sb/ O))
12. It is said that the computer is one of the most important inventions.
(vì đây là cấu trúc câu bị động không chủ ngữ: It is + said/considered + that + clause...)
Học tốt!!!
Tiểu Khôn
