3、般过去时(be用were)would/should/could/might+动词原形与将来事实相反一般过去时或should(wereto)+动词原形Would/should/cold/might+动词原形★★★注意四个情态动词的用法：1. 若表示在某一假设的条件下，必然而然就会发生某事，第一人称可用should或would, 而二、三人称只用would.2. 若表示在某一假设条件下就能够干某事，各人称都用could.3. 如果表示在某种假设条件下有可能会发生某事，各人称都用might.★★★虚拟语气倒装请看典型考题：__________ your address，I would have wr
4、itten to you. A. Did I knowB. Were I to knowC. Had I known D. If I should know此题应选 C。这是虚拟语气的倒装形式。当虚拟条件句中含有 were，had，should，could等动词时，可以将if省略，然后将 were，had，should，could 等词移至句首：1. If he should fail，he would kill himself. →Should he fail，he would kill himself. 万一失败，他就会自杀。2. If I were you，I would do it
5、at once. →Were I you，I would do it at once. 假若我是你，我就会马上做。3. If he had seen you yesterday，he would haveasked you about it. →Had he seen you yesterday，he would haveasked you about it. 他昨天要是看到了你，他就会问你这事了。注意：顺便说一句，以上移至句首的 had不一定是助动词，如果是实义动词也可倒装★★★错综虚拟语气How I wish I had studied harder when I was in schoo
6、l!If you had, you ____ work into late every day nowadays.A. don’t B. wouldn’t C. didn’t D. won’t[解析]“要是我在校时能够更加努力地学习，那该多好啊！”“要是你当时努力学习的话，你现在就不会每天都工作那么晚了。”根据句意，条件与过去事实相反，而主句与现在事实相反。常见的两种错综虚拟语气：1．从句与过去事实相反相成，而主句与现在事实相反。例如： If you had not been strict with me when I was young, I could not b
7、e such a successful person now.如果我年轻时你没有对我严格要求的话，我现在就不可能是这么成功的一个人。（这种虚拟语气的特点是主句中常含有时间准状语now 或nowadays）★★★含蓄虚拟条件句含蓄虚拟条件句是指句中没有明显的虚拟条件句，而是利用其他手段来暗示存在虚拟条件。这类用法主要见于以下七种方式：1. 将条件隐含在不定式短语中。I should be happy
