二、表原因,可以和原因状语从句互换。如: Not knowing her address, I wasn't able to contact her. = Because I did not know her address, I wasn't able to contact her. 三、表条件,可以和条件状语从句互换。如: Walking to work, you will save quite a lot of m...
It is necessary that the badly wounded man(should) be treated immediately. 二、过去时态类 英语中,还有一些词或短语后接的从句或句子,也要使用虚拟语气,虚拟语气是通过句中的谓语...
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