`1`.The teacher gets challenging problems solved by the students.

`-` Bị động nhờ vả:

S + get + sb + to V-inf + sth

⇒S + get + sth + V3/ ed + by sb

`2`.   An unforgettable performance was delivered to the audience by the band.

`-`Bị động(QKĐ):S+was/were+Ved/PII+(by O)

`3`.All the clothes were sold to Sue’s customers.

`-`Bị động(QKĐ):S+was/were+Ved/PII+(by O)

`4`.I got my teeth cleaned by the dentist.

`-` Bị động nhờ vả:

S + get + sb + to V-inf + sth

⇒S + get + sth + V3/ ed + by sb

`5`.We were served delicious pasta by the waiter at the restaurant.

`-`Bị động(QKĐ):S+was/were+Ved/PII+(by O)

$#Vaan Haa$

1. The students are gotten by the teacher to solve challenging problems.
2. An unforgettable performance was delivered by the band to the audience.
3. All the clothes were sold by Sue to her customers.
4. I got my teeth cleaned by the dentist.
5. Delicious pasta was served to us by the waiter at the restaurant.

$#Giải thích:$

_ Cấu trúc câu bị động 

_ Bị động(QKĐ): S + was/were+ V(cột 2/ ed) + O + ....

_ bị động nhờ vả:

_ S + get + sth + V(cột 3/ ed) + by sb + ....

_ was dùng vs S số ít

_ were dùng vs S số nhiều