[文法] 關係代名詞「than」的用法?

[jajamba (閉關一陣子!!!)]

    請教各位網友，有關"than"的關代用法中，下列兩句中的"than"可以替換

    成什麼字呢?謝謝;各位的回答!


  ●Don't give him more money than is necessary.

  ●He returned home much sooner than was expected.

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推 RyeCatcher:第一句than=than the money which
→ RyeCatcher:第二句than=than he that
推 jajamba:可以請問一下，那麼than在此就不是連接詞了嗎?