1．表示时间 动词的-ed形式作状语表示时间.相当于一个时间状语从句. Seen from the tower, the city looks beautiful. 从塔上往下看.城市显得很美丽.(= When the city is seen from the tower...) Shown the lab, we were taken to see the library. 带我们参观了实验室之后.又带我们参观了图书馆.(= After we had been shown the lab...) Completely examined by the doctors, he went back to school right away. 经过医生彻底检查以后.他立刻回到了学校.(= After he was completely examined...) 提示: 有时动词的-ed形式前可加连词when或while来强调时间概念. When asked why she was late for class again, she hung her head in shame. 当被问到为什么上课又迟到时.她羞愧地低下了头. Once recovered, he went all out to do his work. 一恢复健康.他就全力以赴地干起了工作. Once started, the clock will go half a month and keep good time.一旦给这钟上了发条.它就会走半个月.并且走得很准. 【查看更多】
