`1.` The aircraft has been designed by famous engineers.

`\text{HTHT bị động: S + have/has + been + VPII + (by+ O).}`

`2.` My windows have been broken by John.

`\text{HTHT bị động: S + have/has + been + VPII + (by+ O).}`

`3.`Tim hasn't seen since he left school in 1990.

`\text{HTHT bị động: S + have/has + been + VPII + (by+ O) + (time).}`

`4.`Your room must be kept tidy.

`\text{ĐTKT bị động: S + ĐTKT + be + VPII + (by + O).}`

`5.` Those books will be retunred to the library by Tom tomorrow.

`\text{TLĐ bị đông: S + will be + VPII + (by+ O) + (time).}`

`6.` Ths could be done so much easily by the machine.

`\text{ĐTKT bị động: S + ĐTKT + be + VPII + (by + O).}`

`7.` Her work has finished (by them) tonight.

`\text{HTHT bị động: S + have/has + been + VPII + (by+ O) + (time).}`

`8.` Dogs must be kept in the garden.

`\text{ĐTKT bị động: S + ĐTKT + be + VPII + (by + O).}`

`9.`  You were visited yesteday.

`\text{QKĐ bị động: S + was/were + VPII + (by +O) + (time).}`

`10.` This book was bought (by him) last week.

`\text{QKĐ bị động: S + was/were + VPII + (by +O) + (time).}`