答案一、复习：BBAAB二、自主学习：If 从句与过去事实相反，故用 had done, 主句与现在事实相反，故用 would be.AB三、虚拟语气的其他用法：在宾语从句中的应用。表示命令、建议、要求等的动词+宾语从句，从句用虚拟语气。（should ）+ do 的形式。常见的词：suggest，advise，recommend，propose；order，command；require，request，demand；insist。are wereACBCI demanded he (should ) answer me immediately.在主语从句在的应用。1. It is necessary(important, natural, strange, etc.) + that 句。2. It was a pity (a shame, no wonder, etc.)that +that 句。3. It will be desired(suggested, decided, ordered, requested, proposed, etc.) that +句。用（should）+doBCB在表语从句，同位语从句中的应用。表示建议、要求和命令对应的名词后面跟表语从句或同位语从句时，从句通常用虚拟语气（should）+ do。DBAMy suggestion is that you should practice speaking English as often as possible.在状语从句中的应用。Even if/even though, as if/as though 引导状语从句时，如表示与事实相反时用虚拟语气。She talked about the film as if she had seen it before.ACCMr Green spoke slowly so that/in order that he could make himself heard clearly by his students.四、虚拟语气的几个句式：Wish 句式：Wish that +句子。“但愿……就好了”。与现在事实相反，谓语动词用过去式、be（were）; 与过去事实相反，用 had done; 与将来事实相反，用 would + do.CBIf only /only if 句式：If only 通常要用虚拟语气。而 only if “只有……才……”，放在句首，用部分倒装。时间If 条件句（谓语动词形式）主句（谓语动词形式）现在过去式/be(were)would/should…do过去had doneWould/should…have done将来过去式/should do/were to doWould/should do省略 if把 had、were、should 等提到句首，用倒装语序DIt’s (high ) time that……, would rather that……句式：It’s time that……, 通常用过去式、be（were）,或用 should +do。Would rather that……与现在事实相反，谓语动词用过去式,be(were)；与过去事实相反，用 had done; 与将来事实相反，用过去式。DABC含蓄句式：But for/otherwise/or/without 等引导短语相当于 if 引导的条件状语从句，句子使用相应的动词形式。ADB
