as作連詞的用法:
1、作,當的時候,引導時間狀語從句。
例句:As a young man, he was active in sports。
2、as等于since,作既然。
例句:As he wasn't ready in time, we went without him。
3、作,雖然、盡管,引導讓步狀語從句。
例句:Tired as they were, they walked on。
as作關系代詞的用
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