Please don’t talk so aloud while others are working.

　　While I am washing the floor, you can be cleaning the windows. While也可表对比。 I like reading while he prefers listening to music. 谚语：Strike the iron while it is hot. (3)as用作连接词表示时间关系时，意思也是“当(在)……时候”，往往可与when或while通用，但它着重指主句和从句中的动作或事情相并发生。例如：

　　I saw him as he was getting off the bus. As he walked on, he felt himself getting more and more tired. As time passes by, we grow older and learn more. As industry develops,more and more farmland has been taken up. 2．一些表示时间的名词短语也可用来引导时间状语从句 the minute, the moment, the instant, every time, the last time, every time。如： The first time I got to the island, I was amazed by its beauty.

　　The moment I entered the room, I smelled something unusual.

　　Every time I visit him, he is always reading.

　　3．directly和immediately也可作为连词，引导时间状语从句，意为“一……就……”，相当于the moment/the instant和as soon as。如： I knew something was wrong directly I arrived.

　　The boys did all sorts of mischief immediately my back was turned. 4．before 和after before 引导的从句的动作通常发生在主句动作之后，如果从句是过去时，主句一般要用过去完成时或一般过去时。after引导的从句动作通常发生在主句动作之前，如果主句要用过去时，从句则要用过去完成时或一般过去时。例如： The plane had taken off before he arrived at the airport.

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