Áp dụng cấu trúc: Subject + Verb + By Object
14, The tickets are usually bought at the box office by the children.
15, Their homework has been finished by them.
16, Our exercise will be correct by the teacher tomorrow.
17, Was this show watch by them?
18, That novel wasn't written by Mrs. Allen in 1998.
19, The letter was left on the desk some minutes ago by him.
20, The chickens will be fed by us later.
21, The report in the office is being typed by Mary.
22, Are you going to be helped by your father?
23, The window has been broken by someone.
24, This shirt shouldn't be washed with detergent by you.
25, The test will be taken by us next week.
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