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    【题目】α，β是两个不同的平面，m，n是平面α及β之外的两条不同的直线，给出四个论断：①m⊥n；②α⊥β；③n⊥β；④m⊥α.以其中三个论断作为条件，余下一个论断作为结论，写出你认为正确的一个命题：__________.

    【答案】若①③④，则②(或若②③④，则①)

    【解析】由面面垂直的判定，可知①③④②为真；

    由面面垂直的性质，可知②③④①为真．

    ∴应填“若①③④，则②”，或若“②③④，则①”．

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