Complete the following mind map according to what you have learned in this unit. 根据本单元所学内容完成思维导图。
Why do we need rules?
A Signs and rules
Signs and rules are everywhere.
· We hear about rules at the station.
These rules tell people what to do and what not to do on the
, and . Following these
rules helps us keep when we take the underground.
· Other signs I see in my life:

announcements、underground、escalator、the platform、the train、safe、No smoking. go straight, etc

B Rules in different places
· Dos and don'ts in the lab:
▪ Don't wear .
▪ Never .
▪ No .
▪ Always wear .
▪ Always throw .
· To give orders, I can say:
Be quiet.

open-toed shoes; leave rubbish; food or drinks; safety gloves; broken glass into the broken glass
container
Be quiet.; Never litter.; Don't be late.; No smoking.