英文關係副詞-why(Relative adverbs-why in English)

關係副詞why用來表示「原因」。
關係副詞why的用法簡單而言，先行詞是reason，直接加上關係副詞why就行了。
句型：S+V+the reason+why+S+V.
Tom explained the reason why he did not go to the school.(Tom解釋他沒去學校的原因)

用法上也能把先行詞reason省略，而整個why~的部分變為受詞(畫底線部分)
Tom explained why he did not go to the school.(Tom解釋他沒去學校的原因)

參見(See also)
關係子句(Relative clause)
關係代名詞(Relative Pronoun)
複合關係代名詞(Compound relative pronoun)
關係副詞(Relative adverbs)
　關係副詞-when(Relative adverbs-when)
　關係副詞-where(Relative adverbs-where)
　關係副詞-why(Relative adverbs-why)
　關係副詞-how(Relative adverbs-how)
分裂句(Cleft sentence)