8. This work must be finished before Sunday by you.
(S+ must+be+V-ed/V3+by O)
9. This bicycle hasn't been used for a long time by her.
(S+has/have+been+V-ed/V3+by O)
10. A strange man was seen in my garden yesterday by me.
(S+was/were+V-ed/V3+by O)
11. The floor is cleaned every morning by them.
(S+is/am/are+V-ed/V3+by O)
12. The problem will be solved soon by them.
(S+will+be+V-ed/V3+by O)
CHÚC BẠN HỌC TỐT!