=>
1. By whom was this letter written?
-> bị động QKĐ Was/Were S V3/ed?
2. Rugby has never been played by Joe and Gerry.
-> bị động HTHT have/has been V3/ed
3. Have the keys been found?
-> bị động HTHT have/has S V3/ed?
4. Was this beautiful dress bought by Mary?
-> bị động QKĐ Was/Were S V3/ed?
5. Has the most valuable painting in the national museum been stolen by the thieves?
-> bị động HTHT have/has S V3/ed?
6. How is this problem going to be dealt with?
-> bị động Is/Am/Are S going to be V3/ed?
7. How is this amount of money spent?
-> bị động HTĐ Is/Am/Are S V3/ed?
8. How was the lost man found by the police?
-> bị động QKĐ Was/Were S V3/ed?