(6)万一杯子掉下来会打碎的。

　　If you dropped / should drop / were to drop the glass, it would break.

　　【结论3】

　　条件与将来

　　事实相反 从句谓语用一般过去时(be多用were)或should ＋动词原形 /

　　were to do

　　主句谓语用would / should / could / might＋动词原形

　　【疑难1】

　　含蓄虚拟句(即含有without /

　　but for, otherwise /

　　or等词的句子)

　　【例句观察】

　　Human beings would die without water. (＝Human beings would die if there were no water. )

　　I couldn't have succeeded but for your help. (＝I couldn't have succeeded if you hadn't helped me. )

　　I had no money then. Otherwise I would have bought that book.

　　(＝If I had had money then, I would have bought that book. )

　　【疑难剖析1】含有without /

　　but for，otherwise /

　　or等词的句子谓语结构等同于if主从句中主句的谓语结构。

　　与现在或将来事实相反 would / should / could / might＋动词原形

　　与过去事实相反 would / should / could / might＋have done

　　【疑难2】

　　含有had，should，were这三个词的虚拟条件状语从句

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