1. Take off your coat.

Your coat must be taken off

2. Don't do that silly thing again

that silly thing mustn't be done again

3.Let's tell them about it

Let they be told about it

4.Don't let other see you

Don't let you be seen by other

5. Finish your work

Your work must be finished

6.Make people understand you in English

People must be made to understand you in English

7.Rewrite your answer

Your answer must be rewritten

8. Don't enter the room

The room mustn't be entered

9. Don't tell this to anyone

This musn't be told to anyone

10. Do all the exercises by tomorrow.

All the exercised must be done tomorrrow