Đáp án:
1, Have the thieves stolen the most valuable painting in the national museum?
`->` Has the most valuable painting in the national museum been sloten by the thieves?
2, How many languages do they speak in Canada?
`->` How many languages are spoken in Canada?
4, He has broken his nose in a football match.
`->` His nose has been broken in a football match by him.
5, Have you finished the above sentences?
`->` Have the above sentences been finished ?