4 Change the sentences. Use must or mustn't.
1 You must switch off your phone when you
drive.
1 Switch off your phone when you drive.
2 Don't cross the road when the light is red.
3 Be careful when you cross the road.
4 Walk on the pavement.
5 Don't cycle on the pavement.
6 Fasten your seat belt.
7 Don't drive more than 60 kph.
8 Cycle in the cycle lane.​

1we  went  to the skating-rink  yesterday. 2 they  grew  even grapes in their orchard some years ago. 3  last week  they  hung  a new mirror in the bathroom. 4 we  had  a delicious dinner at a restaurant  last saturday. 5 she  laid  the table and invited her guests to have dinner. 6 they  heard  some strange sounds behind the door of the house. 7 tom  hid  behind the tree and  watched  the boys sitting by the fire. 8 the young archer  hit  the aim/target. 9 the students  held  a meeting on friday. 10  he  fell  down and  hurt  his leg. 11 their granny  kept  a cow and some rabbits on the farm. 12 she  knew  very well that  boy who lived next door to them.  13 he  knew  a lot of poems by heart.