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home rule
do housework
We should help to do housework.
class rule
eat
Don’t eat in class.
home rule
get up
We should get up early.
We shouldn’t get up late.
home rule
read in bed
We shouldn’t read in bed.
pick flowers
摘花
We shouldn’t pick flowers.
We mustn’t pick flowers.
We shouldn’t litter .
We mustn’t litter .
litter
乱丢杂物
keep off the grass 不要进入草地
We should keep off the grass.
We must keep off the grass.
take good care of young children
照看好儿童
We should take good care of young children.
We must take good care of young children.
green light
cross the street