Period Two Learning about Language虚拟语气(二)1．与过去事实相反的虚拟条件句在该类条件句中，条件从句中的谓语动词用 had＋过去分词，主句中的谓语动词用would/should/might/could＋have＋过去分词。If he had known the facts, he could have told us what to do.如果他了解事实，他就能告诉我们怎样做。If I had been less cautious, I might have been more wise.如果我不那么谨慎，我或许更明智。If he had received the present，he should have thanked her.如果他收到了礼物，他是应当向她道谢的。2．对将来情况假设的虚拟条件句该类条件句表示将来实现的可能性不大。if 从句中的谓语动词可以用三种形式，即should ＋ v., were to ＋ v. 或 动 词 的 过 去 式 ， 主 句 中 的 谓 语 动 词用 should/would/could/might＋v.。If you dropped the glass, it would break.杯子摔下来会打碎的。If I were to go to the moon some day, I could see the surface of the moon with my own eyes. ＝ If I should go to the moon some day. . . ＝ If I went to the moon some day. . .要是有一天我上了月球，我就能亲眼看到月球的表面是什么样子了。If it were to rain tomorrow, the meeting would be put off.如果明天下雨，会议就将被推迟。If there should be a flood, what should we do?万一发生水灾，我们该怎么办？注意：有时从句中的谓语动词由 should＋动词原形构成，主句的谓语却不一定用虚拟语气，这种情况实现的可能性虽小，但也不是完全没有可能。Ask her to ring me up if you should see her.万一你见到她，让她给我打电话。现将虚拟条件句的三种情况列表如下：假设情况条件从句的谓语形式主句的谓语形式与过去事实相反过去完成式(had＋过去分词)＋have＋过去分词与现在事实相反过去式(be 的过去式常用 were)＋动词原形与将来事实相反① 过去式② should＋动词原形③ were to＋动词原形3.有关虚拟条件句的几种情况(1)条件从句中的谓语部分有 were，should 和 had 时，if 有时可以省略，这时从句中的主语和谓语要用倒装语序。Were I you，I would go with them.如果我是你的话，我就跟他们一起去。Should I have time，I would call on her.我要是...
