1你不能随便乱扔空瓶子.
the empty bottles must not been thrown away.
2我们必须教孩子们怎样安全的过马路
the children must been taught how to cross the road safetly.
3你必须把你的答案写在纸的一边
the ansewer must be writen on the one side of the paper only.
4对于孩子们,热门应该把课程弄的更 有趣些.
the lessons should be more interesting for childern.
5人们不应该在公共场合讨论太多的事情.
things ought not to be talked in public