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问题: 问一个语法问题

becarse words are much more easily changed when rsed again and again in speech than when copied in wuiting.一句中的copied是被动吗?如果是为什么前面不加be呢?

解答:

当状语从句的主语与主句的主语一致时,状语从句主语可省略.状语从句的谓语动词变成现在分词(如果是主动语态)或过去分词(如果是被动语态).如:When she found her lost father, Miss Zhang felt so happy.可说成:When finding her lost father, Miss Zhang felt so happy.