Rewrite the following sentences into the passive voice. 1. It is your duty to make tea at eleven o'clock. 2. You don't nee to wind this watch. 3. Before they invited printing people had to write everything by hard. 4. The boss had his secretary type all these letters. (typed) 5. They employed the workers to repair their house.(had) 6. They say that elephants never forget. (forget) 7. I don't want the others think of me as a burden. (thought) 8. People thought that he killed his wife. (been) 9. I remember that someone gve me that shirt on my birthday. (remember) 10 It is your duty to o your homewwork before class-time. (you)

`1)` Tea is to be made by you at eleven o'clock

`2)` This watch doesn't need to be wound.

`3)` Before printing was invented, everything had to be written by hand.

`4)` The boss had all these letters typed by his secretary.

`5)` They had their house repaired by the workers.

`6)` It is said that elephants never forget.

`7)` I don't want to be thought of as a burden by the others.

`8)` He was thought to have been killed his wife.

`9)` I remember being given that shirt on my birthday.

`10)` You are supposed to do your homework before class-time.

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`***` Bị động các thì : 

`-` BD `-` Hiện tại đơn : S + am/is/are + V (ed/P3) + ( by O ).

`-` BD `-` Hiện tại tiếp diễn :  S + am/is/are + being + V ( ed/P3 ) + ( by O ).

`-` BD `-` Hiện tại hoàn thành : S + have/has + been + V ( ed/P3 ) + ( by O ).

`+)` I + am 

`+)` You/we/they/danh từ số nhiều + are

`+)` She/he/it/ danh từ số ít + is.

`-` BD `-` Quá khứ đơn : S + was/were + V ( ed/P3 ) + ( by O ).

`-` BD `-` Quá khứ tiếp diễn : S + was/were + being + V ( ed/P3 ) + ( by O ).

`+)` You/we/they/danh từ số nhiều + were.

`+)` I /She/he/it/ danh từ số ít + was.

`-` BD `-` Quá khứ hoàn thành : S + had + been + V ( ed/P3 ) + ( by O ).

`-` BD `-` Tương lai đơn : S + will + be + V ( ed/P3 ) + ( by O ).

`-` BD `-` Tương lai hoàn thành : S + will have been + V ( ed/P3 ) + ( by O ).

`-` BD `-` Tương lai tiếp diễn : S + will + be being + V ( ed/P3 ) + ( by O ).

`-` BD `-` Tương lai gần : S + am/is/are + going to + V ( ed/P3 ) + ( by O ).

`-` BD `-` Động từ khuyết thiếu : S + can/should/may/must + be + V ( ed/P3 ) + ( by O ).

`***` Bị động các từ chỉ giác quan : 

`+)` S + see/watch/hear + sb + V-infi

`->` S + be + seen/watched/heard + to V-inf

`+)` S + see/watch/hear + sb + V-ing

`->` S + be + seen/watched/heard + V-ing

`***` Bị động tường thuật :

`-` Chủ động : S + say/belive/think/know/expect/report + that + S + V + O

`=` It is + said/believed/thought/knew/expected/reported + that + S + V + O.

`=` S + be + said/believed/thought/knew/expected/reported + to do/to be doing/ to have done.

`***` Bị động nhờ vả :

`-` S + have + sb + V 

`->` S + have + sth + V (ed/P3).

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

`->` S + get + sth + V ( ed/P3 ).

`@` Trong câu bị động “by + O” luôn đứng sau trạng từ chỉ nơi chốn và đứng trước nó là trạng từ chỉ thời gian .