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You’d better (not)…
It’s impolite to…
Don’t…
silence the phone
Bad manners still exist…
Tip（for description）：
Use complete sentences
整句
litter everywhere
*
What tool can we use to advise people to behave politely in public?
Task 3 Think and guess!
a parking lot
v.
park your car
in
warning sign
things to us
n.
warn
v.
break
keep
explain
be used 被用于
in
public places
use
bright colors
features 特征