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* 用来表示说的话不是事实,或者是不可能发生的情况,而是一种愿望、建议、假设的语气叫虚拟语气。 (一)if主从句中的虚拟语气 【完成例句】 (1)如果我是你,我会接受邀请的。 If I were you, I should accept the invitation. (2)如果我有空,我就去那儿。 If I had time, I would go there. 【结论1】 主句谓语用 would / should / could / might+动词原形 从句谓语用一般过去时(be多用were) 条件与现在事实相反 【完成例句】 (3)如果你早点来,你就不会错过那辆公共汽车了。 If you had come earlier, you couldn't / wouldn't have missed the bus. (4)如果他昨天见到了你,他就会还你的书的。 If he had seen you yesterday, he would have returned your book. 【结论2】 条件与过去事实相反 主句谓语用would / should / could / might+have done 从句谓语用had done 【完成例句】 (5)万一明天下雨,运动会就推迟。(事实上明天下雨的可能性不大。) If it should rain / were to rain / rained tomorrow, the sports meet would be put off. (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】 主句谓语用would / should / could / might+动词原形 从句谓语用一般过去时(be多用were)或should +动词原形 / were to do 条件与将来 事实相反 【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。 would / should / could / might+have done 与过去事实相反 would / should / could / might+动词原形 与现在或将来事实相反 【疑难2】 含有had,should,were这三个词的虚拟条件状语从句 Had they had time(=If they had had time), they would have certainly come to help us. Should it be fine(=If it should be fine),we would go for an outing. Were I you(=If I were you), I would go. 【疑难剖析2】含有had,should,were这三个词的虚拟条件状语从句,在正式或书面语言中可将if省略,把had,should,were 提前放到句首,变为部分倒装。 【疑难3】 if混合虚拟条件从句(即主从句分别与不同的事实相反) If the weather had been finer, the crops would be growing still better. If you had followed the teacher's advice, you wouldn't be in hospital. 【疑难剖析3】if假设条件从句谓语动词发生的时间与主
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