Change the sentences from active voice to passive. 11. the lecturer has just given the lecture. 12. the housewife is sweeping the floor now. 13. the sailors had crossed the equator. 14. they will have solved the equations. 15. the moters forgave the children. 16. the workers destroyed the house in 1998. 17. they locked the door after leaving. 18. she is watching an interesting film. 19. the children are drawing the puctures at the moment. 20. they will repair the computer next week.

11. The lecture has just been given by the lecturer. 
12. The floor is being swept by the housewife.
13. The equator had been crossed by the sailors.
14. The equations will have been solved.
15. The children were forgiven by the mothers. 
16. The house was destroyed by the workers in 1998.
17. The door was locked after leaving. 
18. An interesting film is being watched. 
19. The pictures are being drawn by the children at the moment. 
20. The computer will be repaired next week.