`23.` This work must be completed by you today.

$-$ Câu bị động với động từ khuyết thiếu (Must): S + must + be + V (Pii) + (by O).

`24.` Have the curtains been changed by you yet?

$-$ Câu bị động thì hiện tại hoàn thành- Nghi vấn: Have/ Has + S + been + V (Pii) + (by O)?

`25.` Will these rooms be cleaned tomorrow?

$-$ Câu bị động thì tương lai đơn- Nghi vấn: Will + S + be + V (Pii) + (by O)?

`26.` I was given a book by my teacher this morning.

$-$ Câu bị động thì quá khứ đơn: S + was/ were + V (Pii) + (by O).

`27.` A new hospital will be built in his area next year.

$-$ Câu bị động thì tương lai đơn: S + will + be + V (Pii) + (by O).

`28.` English is spoken in many African countries.

$-$ Câu bị động thì hiện tại đơn: S + am/ is/ are + V (Pii) + (by O).

`29.` Your computer can be attacked by viruses at any time.

$-$ Câu bị động với động từ khuyết thiếu (Can): S + can + be + V (Pii) + (by O).

`30.` Quang's homework wasn't done by him last night.

$-$ Câu bị động thì quá khứ đơn: S + was/ were + V (Pii) + (by O).

`31.` The bill won't be paid by Jack.

$-$ Câu bị động thì tương lai đơn- Phủ định: S + will not/ won't + be + V (Pii) + (by O).

`23.` This work must be completed today.

`24.` Have the curtains been changed yet?

`25.` Will these room be cleaned tomorrow?

`26.` I was given a book by my teacher this morning.

`27.` A new hospital will be built in this area next year.

`28.` English is spoken in many African countries.

`29.` Your computer can be attacked at any time

`30.` Quang's homework wasn't done last night

`31.` The bill won't be paid by Jack.

_____________________________________________________________
`*`Bị đông(Passive Voice):

`-`Thì HTĐ: S + am/is/are + `V3` (by + sb/O)

`-`Thì QKD: S + was/were + `V3` (by + sb/O)

`-`Thì TLD: S + will/shall be + `V3` (by + sb/O)

`-`Modal Verbs: S +can/may/must... + be + `V3` (by + sb/O)

`-`Thì HTHT: S + have/has + `V3` (by + sb/O)