.The teacher is going to tell a story

→ a story is going to be told by The teacher

.Mary is cutting the cake with a sharp knife 

→ the cake is being cut with a sharp knife by Mary

 The children looked at the woman with a red hat.

- The woman with a red hat was looked by the children

They have provided the victims with food and clothing

=> The victims have been provided with food and clothing.

 People speark English all over the world

→ English is spoken all over the world

22.The teacher is going to tell a story
→ a story is going to be told by The teacher

23.Mary is cutting the cake with a sharp knife 
→ the cake is being cut with a sharp knife by Mary

24. The children looked at the women with a red hat.
=> The woman with a red hat was looked by the children

25. They have provided the victims with food and clothing.
=>The victims have been provided with food and clothing.

26. People speak English in almost every corner of the world.
=> English is spoken in almost every corner of the world.

27. You mustn't use this machine after 5:30 p.m.
=>This machine mustn’t be used after 5:30 p.m.