1.Many people visit the Science Museum every day.
The Science Museum is visited by many people every day.
2.We must send him to the hospital at once.
He must be sent to the hospital (by us) at once.
3.Mr Li will teach physics in the lab tomorrow.
Physics will be taught by Mr.Li in the lab tomorrow.
4.Are you going to wash all the glasses.
Are all the glasses going to be washed by you?