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在英语的从句中,as通常用作连词,表示“当……的时候”、“正如”等含义。as在从句中的作用有以下几个方面:
1. 引导时间状语从句
as可以引导时间状语从句,表示两个动作同时发生,或者第一个动作发生时第二个动作正在进行。例如:
- As she was cooking dinner, the phone rang. (当她在做晚饭的时候,电话响了。)
- He arrived just as the movie was starting. (他刚到,电影就开始了。)
2. 引导原因状语从句
as可以引导原因状语从句,表示原因或解释。例如:
- As he was sick, he couldn't come to the party. (因为他生病了,所以不能来参加聚会。)
- As you know, English is a global language. (正如你所知道的,英语是一种全球性语言。)
3. 引导方式状语从句
as可以引导方式状语从句,表示方式或手段。例如:
- He wrote the letter as his teacher had instructed. (他按照老师的指示写了信。)
- She spoke as if she knew everything. (她说话的样子好像什么都知道似的。)
总之,as在从句中可以起到引导时间、原因和方式状语从句的作用,为句子的连贯性和表达精确性提供了帮助。