we are looking forward to the olympic games beause they have never been held before in the countrybefore是什么词 什么成分 修饰什么?he acted as if he had never lived in england beforebefore是什么词 什么成分 修饰什么?
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we are looking forward to the olympic games beause they have never been held before in the countrybefore是什么词 什么成分 修饰什么?he acted as if he had never lived in england beforebefore是什么词 什么成分 修饰什么?
we are looking forward to the olympic games beause they have never been held before in the country
before是什么词 什么成分 修饰什么?
he acted as if he had never lived in england before
before是什么词 什么成分 修饰什么?
we are looking forward to the olympic games beause they have never been held before in the countrybefore是什么词 什么成分 修饰什么?he acted as if he had never lived in england beforebefore是什么词 什么成分 修饰什么?
介词.作时间状语从句,修饰they have never been held .
he acted as if he had never lived in england before.这句话的before也是介词,修饰he had never lived in england .
介词，做状语，they have never been held 在这个句子里做状语，谈不上修饰什么
这两个句子都是介词做状语。
before的另一种用法是连词，引导一个从句