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traffic rules
Go !
We must obey the traffic rules.
traffic rules
A. Don’t drive too fast
traffic rules
B. Wait for your turn when the light is red.
traffic rules
C. Turn right.
traffic rules
D. Don’t park here.
traffic rules
E. Be careful!
traffic rules
F. Don’t play on the street.
Traffic rules
Wait for your turn when the light is red.
Turn right.
Be careful.
Don’t drive too fast.
Don’t park here.
Don’t play on the street.
总结：以动词开始的句子叫(Imperatives) 祈使句,表请求，命令，建议;表否定时在句首加 “Don’t”；分为do型和be型。
Be careful !
Don’t turn left.
Cross the road here.
Don’t drive after drinking !
Example:
Keep quiet in class.
Do your homework after school.