He added that a student had dressed up as a policeman and was playing allsorts of silly jokes on people. Both the police and the workmen were grateful to thestudent for this piece of advance information.

　　The student hid in an archway nearby where he could watch and hear everything thatwent on.

　　7.He added that a student had dressed up as a policeman and was playing all sorts ofsilly jokes on people.

　　还对工人说，有个学生常装扮成警察无聊地同别人开玩笑。

　　语言点:句子结构分析:that引导宾语从句，说明added的内容。

　　8.Both the police and the workmen were grateful to the student for this piece ofadvance information.

　　警察与工人都对那个学生事先通报情况表示感谢。

　　语言点:句子结构分析:本句的核心结构是sb.be grateful to sb.for sth.(某人因某事而感激某人)。

　　9.The student hid in an archway nearby where he could watch and hear everythingthat went on.

　　那个学生躲在附近一拱形的门廊里，在那儿可以看见、听到现场发生的一切。

　　语言点:句子结构分析:where引导定语从句，修饰archway,注意并不是修饰副词nearby。That也引导定语从句，修饰everything。