英语造句动词ed形式

作定语：
We needed much more qualified workers.我们需要更多的合格的工人.
My friend is a returned student.我的朋友是个归国的留学生.
Is there anything unsolved?还有没解决的问题吗?
There is noting changed here since I left this town.自从我离开这个城镇以来,几乎没有什么变化.
作状语：
Seen from the hill,the city is beautiful.从山顶看,这座城市非常美丽.
Confined to bed (= Because she was confined to bed),she needed to be waited on in everything.她卧病在床,什么事都需要人伺候.（作原因状语）
Having only book knowledge (= If you only have book knowledge),you will not be able to work well.如果只有书本知识,你就不可能做好工作.（作条件状语）(= If you only have book knowledge), 这样括号里是什么意思？同义句