Bài 4:

`1.` A gift was sent to me by my old students.

=>My old students sent a gift to me. 

`2.` You are not allow by the teacher to cheat in the exam.

=>  The teacher doesn't allow you to cheat in the exam 

`3.` My table is being fixed by my father.

=>  My father is fixing my table

`4.` How long has this fax machine been used by Mr. Green?

=> How long has Mr. Green used this fax machine?

`5.` The singer was not recognized by his fan when he was at the restaurant.

=> The singer's fan didn't recognize him when he was at the restaurant

`6.` He will be disqualified from the competition by the judges if he uses drugs.

=> The judges will disqualify him from the competition if he uses drugs.

`7`. All the unnecessary lights will be turned off to save energy.

=> They will turn off all the unsuccessary lights to save energy 

`8.` Jane was prevented from staying up too late by her mother.

=> Jane's mother prevented her from staying up to late 

`9.` Was this document typed by Mr. Brown?

=> Did Mr. Brown type this document?

`10`. Many dead people were found by the recuers after the earthquake.

=> The recuers found many dead people after the earthquake 

1, My old friend sent to me a gift.

2,The teacher doesn’t allow you to cheat in the exam.

3,My father is fixing my table.

4,How long has Mr.Green used this fax machine?

5, His fan didn’t recognize the singer when he was at the restaurant.

6,The judges will disqualify him from the competition if he uses drugs.

7,We will turn off all the unnecessary lights to save energy.

8, Jane’s mother prevented her from staying up too late.

9,Did Mr. Brown type this document?

10,The rescuers found many dead people after the earthquake.