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What should we do in the library?
We should keep quiet in the library.
What did the boy do?
He left the tap running.
vi. 流动
n. 水龙头，旋塞
What is the man doing?
He is queuing for his turn.
queue vi.
(人、车等)排队等候
n.轮流，（轮流的）顺序
What are the man and the woman doing?
They are dropping litter everywhere.
n.垃圾，杂物
Who’s doing right and who’s doing wrong ?
obey the traffic rules
keep quiet in the library
queue for his turn
pick flowers in the park
leave the tap running
drop litter everywhere
We should
keep quiet in the library
obey traffic rules
queue for our turn
We should not
drop litter everywhere
leave the tap running
pick flowers in the park
e