Say what you must/mustn’t: 1. wear a seat belt 2. look both ways when you cross the road 3. walk on the pavement 4. talk to the driver 5. run onto the road 6. lean out of the window !

You must wear a seat belt
You must look both ways when you cross the road
You must on the pavement
You mustn't run onto the road
You mustn't talk to the driver
You mustn't lean out of the window