UNIT 10: IN THE PARK_MS.TIEN(L3,4,5,6))

• You mustn't ride your bike.

• You must ride your bike.

• You mustn't walk on the grass.

• You must walk on the grass.

• You must walk your dog.

• You mustn't walk your dog.

• You mustn't take photo.

• You mustn't eat here.

• You mustn't wash your hands.

• You must put litter in the garbage can.

• You must wash your hands.

• You must be quite.

• You mustn't take photos.

• You must take photos.

• you mustn't ride your bike.

• You must ride your bike.