C4. Vietnamese people celebrate their Lunar New Year Festival around January and February

-> Lunar New Year Festival is celebrated by Vietnamese people around January and February.

 -       chuyển sang CBĐ HTĐ: S + be + V3 (+ by Sb/ O)

C5. Our teacher always advises us to study harder on the second term

-> We are advised to study harder on the second term by our teacher.

-        chuyển sang CBĐ đăc biệt: có thể áp dụng với những từ khác như: advise, invite, ask, beg, order, persuade, remind, tell, warn…  :S + (be) + pp + to V (bị động).

C6. The library of Congress in the USA employs over 5000 employees

-> Over 5000 employees are employed by the library of Congress in the USA.

 -         cấu trúc như câu 1

`4.` Lunar New Year Festival is celebrated by Vietnamese people around January and February.

- Bị động thì HTD 

- S + be + VpII + (by + O) + time

`5.` We are advised to study harder on the second term by our teacher. (bỏ always)

- Bị động thì HTD 

- S + be + VpII + (by + O) + time

`6.` Over 5000 employees are employed by the library of Congress in the USA.

- Bị động thì HTD 

- S + be + VpII + (by + O) + time