作狀語：

　　Seen from the hill,the city is beautiful.

　　從山頂看,這座城市非常美麗。

　　Confined to bed (= Because she was confined to bed),she needed to be waited on in everything.

　　她臥病在床,什么事都需要人伺候。（作原因狀語）

　　Having only book knowledge (= If you only have book knowledge),you will not be able to work well.

　　如果只有書本知識,你就不可能做好工作。（作條件狀語）