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    If it were not for ……

    结构︰if it were not for＋名词/子句，主词＋would/should等＋原形动词…

    说明︰此句型意为“若非（有）…”。此类句构专门用于表示与现在事实相反的。亦可用“but for＋”或“without＋”代替。were可以提前，省略if。

    If it were not for his presence,I would punish you.要不是他在场，我会处罚你的。

    But for your advice,I should have failed.要不是你的忠告，我会失败的。

    But for music(=Were it not for music),life would be dull.要不是音乐，人生会很无聊。

    If it were not for oxygen and nitrogen in the air,no man could live on the earth.

    大气中如果没有氧和氮，人就无法生存于地球了。