`15.` Has the most valuable painting in the national museum been stolen by the thieves?

`17.` How many languages are spoken in Canada?

`21.` When will the work be done (by you)?

`25.` How was the lost man found (by the police)?

Câu bị động:

+) Thì HTĐ: am/is/are + Vpp

+) Thì HTHT: has/have been + Vpp

+) Thì TLĐ: will be + Vpp

+) Thì QKĐ: was/were + Vpp

`15.` Has the most valuable painting in the national museum been sloten by the thieves?

`->` Câu bị động ở HTHT 

`->` Cấu trúc: S + have/has + been + Vp.p + by O

`17.` How many languages are spoken in Canada?

`->` Câu bị động ở HTĐ

`->` Cấu trúc: S + am/is/are + Vp.p + by O 

`21.` When will the work be done by you?

`->` Câu bị động ở TLĐ

`->` Cấu trúc: S + will + be + Vp.p + by O

`25.` How was the lost man found by the police?

`->` Câu bị động ở QKĐ

`=>` Cấu trúc: S + was/were + Vp.p + by O