If the cat (which) I keep were to talk ……
與現在事實相反，用過去簡單式+would /could/should …
與過去事實相反，用過去完成式+同上have p.p.V
解答
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If the cat (which) I keep were to talk ……
與現在事實相反，用過去簡單式+would /could/should …
與過去事實相反，用過去完成式+同上have p.p.V
