=>
21. A special edition has been written for children by the author.
-> bị động HTHT have/has been V3/ed
22. These artificial flowers are made.
-> bị động HTĐ is/am/are V3/ed
23. Is the book John borrowed yesterday returned?
-> bị động HTĐ Is/Am/Are S V3/ed?
24. The old theatre is being pulled down.
-> bị động HTTD is/am/are being V3/ed
25. This room is only used on special occasions.
-> bị động HTĐ is/am/are V3/ed
26. Have you been told anything about it?
-> bị động HTHT Have/Has S been V3/ed?
27. What language is spoken in Japan?
-> bị động HTĐ Is/Am/Are S V3/ed?
28. Her bag has been taken by mistake.
-> bị động HTHT have/has been V3/ed
29. Nothing about it has been done.
-> bị động HTHT have/has been V3/ed
30. It is time he was told what is wrong.
-> bị động QKĐ was/were V3/ed