`30.` Missing animals can't be found.

`31.` This red line must not be crossed.

`32.` Football will be played this Sunday.

`33.` A song would be sung in the party.

`34.` All my messages have been read by Brian.

`35.` The homework was finished by the student.

`36.` A new apartment is bought by my parents.

`37.` His birthday would be celebrated by his friends.

=> Bị động:

- Với động từ khuyết thiếu:

+ Can: (-) S + can't + be + V3/ed + (by O)

+ Must: (-) S + must + not + be + V3/ed + (by O)

+ Would: (+) S + would + be + V3/ed + (by O)

- Thì TLĐ: (+) S + will + be + V3/ed + (by O)

- Thì HTHT: (+) S + have/has + been + V3/ed + (by O)

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

`30,` Missing animals can't be found

`31,` This red line must not be crossed

`32,` Football will be played this Sunday

`33,` A song would be sung in the party

`34,` All my messages have been read by Brian

`->` BĐ - HTHT : S + have/has + been + P2 + (by O) ...

`35,` The homework was finished by the student

`->` BĐ - QKĐ : S + was/were + P2 + (by O) ...

`36,` A new apartment is bought by my parents

`->` BĐ - HTĐ : S + am/is/are + P2 + (by O) ...

`37,` His birthday would be celebrated by his friends

____________________________________________

`@` BĐ - ĐTKK

`->` S + ĐTKK + be + P2 + (by O) ...

`**` ĐTKK bao gồm will, would, can, could, shall, should, must, might, have to, ...