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queue for your turn.
Don’t jump the queue.
Please
we should......
we shouldn't.......
drop litter everywhere.
put the litter into the rubbish bin.
They
They should
we should......
we shouldn't.......
Obey traffic rules.
Don't break traffic rules.
Wait for the green light.
we should......
we shouldn't.......
leave the tap running.
The water will be wasted.浪费
Turn off the tap .
Don't
we should......
we shouldn't.......
smoke in public.
Give up smoking.
spit everywhere.
Don’t
Don't
we should......
we shouldn't.......
Don’t cut in on others.