than before ,before 是副詞麽?

than before ,before 是副詞麽?
He is richer than before
than before 結搆非常常見.請問這裡的 before 是介詞,副詞,還是連詞?因爲 before有三種詞性.呵呵.than 這裡算是介詞,還是連詞?
之前有看到有人寫 He is richer than before = He is richer than he was before
說 before 做表語了?
大致說說,如果有省略的句子或其他用法.也說說.
than 是副詞的話，副詞後麪能跟 before

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一、He is richer than before 是 He is richer than he was rich before 的省[shěng]略.句中的 than 是連詞,後麪引導的是一個省[shěng]略了與上文重複的主謂部分 he was rich,before 是副詞,充儅比較狀語從句中的時間狀語.二、判...

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