几年级会 学虚拟语气

几年级会 学虚拟语气

初三

i: 最基本的虚拟语气句型: 1. 虚拟现在时表示与现在事实相反的假设，其if 从句的谓语形式用动词的过 去式(be 一般用were)，主句用would/ should/ could/ might +动词原形。 　if places were a like, there would be little need for geographers. 如果各个地方都一样，就不需要地理学家了。 2. 虚拟过去时是表示与过去事实相反的假设，if 从句的谓语形式用过去完成时 即had＋过去分词，主句用would / should / could / might + have +过去分词。 　if he had known your address yesterday, he would have telephoned you. 3. 虚拟将来时是表示对将来实现的可能性很小的或不确定的假设。if从句的谓 语形式用一般过去式或用were to / should +动词原形，主句用would / should /could/ might +动词原形。 　if he were to leave today, he would get there by friday 4. 省略if 采用倒装语序的条件句。 　有时可以把含有助动词、情态动词、be或have的虚拟条件句中的连词if 省去，而将had , should, were 等 词 提到主语之前，即用倒装结构。 　 had he worked harder, he would have got through the exams. were he to leave today, he would get there by friday. were i in your place, i wouldn’t do that 5. 有时虚拟条件句并没来if 从句表示出来，而是用介词短语(otherwise, or, without, but for)、上下文或其它方 式来表示。 　we didn't know his telephone number; otherwise we would have telephoned him. without you help, i wouldn’t have achieved so much. but for your help, i would not have succeeded.