````Thank you !
````Go away !
Bob ,please don,t throw rubbish on the floor !Look at Marry .She's throwing rubbish in the bin .Well done ,Marry .
词组：run in the corridors
walk in the corridors
be polite
be rude
be noisy
be quiet
throw rubbish on the floor
throw rubbish in the bin
这个单元是教一些规则之类的课,注意should 和shouldn't