1. Do they speak Chinese in this school?
⇒ Is Chinese spoken in this school ?
2. They make a lot of beautiful toys from recycled plastic.
⇒ A lot of beatiful toys are made from recycled plastic.
3. The children are building a sandcastle.
⇒ A sandcastle is being built by the children.
4. The workers recycle drink cans every day.
⇒ Drink cans are recycled by the workers every day.
5. Somebody has cleaned the room.
⇒ The room has been cleaned.