`46.` Then the glass is washed with a detergent liquid. 

`-` Bị động thì HTD: S + am/is/are + VpII + (by + O)

`47.` The glass pieces are dried completely.

`-` Bị động thì HTD

`48.` The glass pieces are mixed with certain specific chemical.

`-` Bị động thì HTD

`49.` The room was cleaned last night.

`-` Bị động thì QKD: S + was/were + VpII + (by + O) + time.

`50.` I was collected to the airport yesterday afternoon.

`51.` Was your bicycle repaired by your father last Sunday?

`-` Bị động thì QKD: Was/Were + S + VpII + (by + O) + time?

`52.` Many photographs of Ha Noi beauty were taken by him. 

`53.` Some money wasn't lent to me by Tam. 

`-` I wasn't lent any money by Tam. 

`-` Câu bị động có 2 tân ngữ: (lent)

`-` S1 (O1 ở câu chủ động = me `->` I) + was/were (not) + lent + O2 + (by + O) + time.

`-` S2 (O2 ở câu chủ động = any money `->` Some money do đây là câu khẳng định) + was/were (not) + lent + to + O1 (me) + (by + O) + time. 

`54.` This tree was planted by my grandfather five months ago.

`-` Bị động thì QKD

`55.` Many lakes and rivers were polluted in our village by Mr. Hoa.

`56.` A beautiful glass was given to his mother on her birthday by Hung. 

`-` Hung's mother was given a beautiful glass on her birthday by Hung.

`-` Câu bị động có 2 tân ngữ (given)