1 The German didn’t build this factory during the second World 

This factory wasn't built during the second World  by the German
2 The Greens are going to paint this house and these cars for Christmas Day

This house an these cars are going to painted for Christmas Day by the Greens
3 Ann had fed the cats before she went to the cinema

The cats had been fed before she went to the cinema by Ann 
4 The students have discussed the polltion problems since last weed

The polltion problems have been discussed since last weed by the students
5 Have the thieves stolen the most  valuable painting in the national museum? 

Has the most valuable paiting in the national museum been stolen by the thieves?
6 Someone will interview the new president on tv 

 The new president will be interviewed on TV by someone
7 How many language do they speak in Canada?

 How many languages are spoken in Canada?
8 Are many going to repair those shoes?

 Are those shoes going to be repaired?
9 Have you finished the above sentences? 

 Have the above sentences been finished?