S2 + be + V1 (P.P) + to V2 nguyên thể ( khi V1, V2 cùng thì )

      S2 + be + V1 (P.P) + to have + V2(P.P) ( khi V1, V2 khác thì )

3. The children is thought to be in bed.

4. The robber is believed to have worked in the bank.

5. Nuclear power station is believed to be dangerous.

6. He was thought to be on holiday.

7. These cars are known to pollute the environment.

8. The new product is supposed to come out soon.

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PASSIVE VOICE KÉP

      S2 + be + V1-pp + to V2 ( khi V1, V2 cùng thì )

  (Cùng thì ví dụ như cùng ở hiện tại hoặc quá khứ.)

      S2 + be + V1-pp + to have + V2-pp ( khi V1, V2 khác thì )

`3.` The children are thought to be in bed.

`4.` The robber is believed to have worked in the bank.

`5.` Nuclear power stations are believed to be dangerous.

`6.` He was thought to have been on holiday by his colleagues. 

`7.` These cars are known to pollute the environment.

`8.` The new product is supposed to come out soon. 

`-` Cấu trúc câu bị động đặc biệt với động từ chỉ quan điểm, ý kiến:

`-` Cách 2: S + be + VpII (1) + to V-inf (2) + O (Khi V1 và V2 cùng thì))

`-` S + be + VpII (1)+ to have VpII (2)+ O (Khi V1 và V2 khác thì)