1 Computer game are being spent much time  everday by teenagers.

   HTĐ: S+am/is/are+ being+V3+(by+0)

2  Some pictures of this father  were  taken yesterday by hưng.

  qkđ: S+was/were+V3+(by+0)

3 Their rooms may be used for the classrooms.

  S+modal verbs+be+V3+(by+0)

4  The windows were broken last night by the boys.

    qkđ: S+was/were+V3+(by+0)

5    Some students are going to be punished by the teacher.

   tlg: S+ am /is /are+ going to+be+V3+(by+0)

1. Much time is spent on computer game by teenagers every day.

(bị động thì HTĐ: is/am/are + PII)

2. Some pictures of this father were taken away by Hung yesterday.

(bị động thì QKĐ: was/ were + PII)

3. Their rooms may be used for the classrooms.

(bị động với động từ khuyết thiếu: can/must/ may/ might/.... +be + PII)

(chủ ngữ câu bị động là đại từ nhân xưng "they" nên phần by O có thể lược bỏ)

4. The windows were broken by the boys last night.

(bị động thì QKĐ)

5. Some students are going to be punished by the teacher.

(bị động thì tương lai gần: is/ am/ are + going to + be + PII)