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done是过去式还是过去分词
Even people who take no insterest in art cannot have failed to no...
答:
① 虚拟现在时表示与现在事实相反的假设,其if 从句的谓语形式用动词的过去式(be 一般用were),主句用would/ should/ could/ might +动词原形,例如:If I were in your position I would marry her.② 虚拟
过去时是
表示与过去事实相反的假设,if 从句的谓语形式用过去完成时即had+
过去分词
,主句...
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