7. Peter was cleaning the floor at 7a.m yesterday.
8. Our teachers have explained the English grammar.
9. The students have discussed the pollution problems since last week.
10. He has broken his nose in a football match.
11. We should clean our teeth twice a day.
12. Tom will visit his parents next month.
13. The Greens are going to paint this house and these cars for Christmas Day.
14. The students had to hand in the task before Monday.
7. Peter was cleaning the floor at 7a.m yesterday.
The floor was being cleaned by Peter at 7a.m yesterday
8. Our teachers have explained the English grammar.
The English gramma has been explained by our teachers
9. The students have discussed the pollution problems since last week.
The pollution problems have been discussed by the students since last week.
10. He has broken his nose in a football match.
His nose has been broken in a football match.
11. We should clean our teeth twice a day.
Our teeth should be cleaned twice a day
12. Tom will visit his parents next month.
His parents will be visited by Tom next month.
13. The Greens are going to paint this house and these cars for Christmas Day.
This house and these cars are going to be painted for Christmas Day by the Greens
14. The students had to hand in the task before Monday.
The task had to be handed in by the students before Monday.