Change from Active into Passive Voice.
1.She has just posted those letters.
2.The teacher has already checked my test
3.He has just opened all the windows.
4.We have already bought the present.
5.I have just done this exercise.
6.They have already found the key.
7.Somebody is cooking dinner in the kitchen.
8.When I came, somebody hase broken the vase.
9.Somebody was writing the letters at 5 o`clock.
10.They are laying the table at the moment.
11.Somebody has taken the chairs from the classroom.
12.He is teaching now.
13.They had caughtthe fish before we arrived.