I. CHANGE THE SENTENCES INTO PASSIVE VOICE 1. The manager always welcomes new employees 2. Janet's colleagues gave her a present when she was tired 3. Thomas Edison invented the photography in 1877 4. Stephen Court has just invented an armchair which can play music 5. Where will your company send you next year? 6. Had a special messenger delivered the package before you got to the office? 7. The students usually hold the concerts at the University 8. The police found two children in the forest 9. The scientists are studying the problem carefully 10. Someone introduced me to Dr Felix last year

1, New employees are always welcomed by the manager.

2, Janet was given a present by her colleagues when she retired.

3, The photography was invented by Thomas Edison in 1872.

4, An armchair which can play music has just been invented by Stephen Court.

5, Where will you be sent by your company next year?

6, Had the package been delivered by a special messenger before you got to the office? 

7, The concerts are usually held at the university by the students.

8, Two children were found in the forest by the police.

9, The problem is being carefully studied by the scientists.

10, I was introduced to Dr Felix last year.

GIẢI THÍCH:

Hiện tại đơn

S + V(s/es) + O

=>S + am/is/are + P2

Hiện tại tiếp diễn

S + am/is/are + V-ing + O

=>S + am/is/are + being + P2

Hiện tại hoàn thành

S + have/has + P2 + O

=>S + have/has + been + P2

Quá khứ đơn

S + V(ed/Ps) + O

=>S + was/were + P2

Quá khứ tiếp diễn

S + was/were + V-ing + O

=>S + was/were + being + P2

Quá khứ hoàn thành

S + had + P2 + O

=>S + had + been + P2

Tương lai đơn

S + will + V-infi + O

=>S + will + be + P2

Tương lai hoàn thành

S + will + have + P2 + O

=>S + will + have + been + P2

Tương lai gần

S + am/is/are going to + V-infi + O

=>S + am/is/are going to + be + P2

Động từ khuyết thiếu

S + ĐTKT + V-infi + O

=>S + ĐTKT + be + P2