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作业精灵老师示例：

In the park,we can go boating and have a picnic.We

must follow the rules.We can't ride a bike or fly a kite.We

mustn't pick flowers or smoke.We also can't play volleyball.

policeman

rules

carefully

road

street

look

right

green

quickly

play

tops

raffic

eep

ustn't

rivers

ules

can't/mustn't/shouldn't walk

in the library/on the metro/in a bookshop

we can't/mustn't/shouldn't eat or drink there