1.They are eating a cake.

=> A cake is being eaten by them

2.English people speak English.

=> English is spoken by English people

3.People wear glasses.

=> Glasses are worn

4.The children drinks whisky

=> Whisky is drunk by the children

5.Our children keep a cat and a dog as pets.

=> a cat and a dog are kept as pets by our children

6.A rooster does not lay eggs.

=> Eggs aren't laid by a rooster

7.Sheep give the wool.

=> The wool is given by sheep

8.Mother did not serve dinner.

=> Dinner wasn't served by mother

9/They left hats and coats here.

=> hats and coats are left here by them

10. They cannot hold the meeting in that room.

=> The meeting cannot be held in that room