小学阶段需掌握的英语语法 谈谈虚拟语气小学英语课堂,七、虚拟语气在主语从句中的用法 　　句型：It is (或was) + 形容词(或过去分词) + that …… +should + 动词原形…… 　　句子：It is natural that she should do so. (形容词natural, should+动词原形do) 　　常用的形容词： 　　* natural (自然的), appropriate (适当的),advisable (合适的), preferable (更可取的), better (更好的) 　　* necessary (必须的), important (重要的), imperative (急需的), urgent (急迫的), essential (本质的), vital (必不可少的) 　　* probable (很可能的), possible (可能的) 　　* desirable (极好的) 　　常用的过去分词(Past Participle): 　　* required (需要的), demanded (要求), requested (被请求的), desired (要求) 　　* suggested (建议), recommended (推荐) 　　* orderd (命令) 　　1. It is necessary that we (should 可省略,下同)have a walk now. 　　(necessary, should + have) (表示有需要去散步) 　　2.It was necessary that we (should) make everything ready ahead of time. 　　(necessary, should + make) (表示有必要事先做好准备) 　　3. It is required that nobody (should) smoke here. 　　(required, should + smoke) (表示要求不要在此抽烟) 　　4. It is important that every pupil (should) be able to understand the rule of school. 　　(important, should + be) (表示重要的是学生都能了解校规) 　　5. It's important that we (should) take good care of the patient. 　　(important, should + take) (表示重要的是照顾好病人) 　　谈谈虚拟语气(Subjunctive Mood)(七) 　　八、虚拟语气在条件从句(Protasis)中的用法： 　　条件从句有两类：(1)真实条件句;(2)虚拟条件句。如果假设情况有可能发生的，就是"真实条件句"。如： 　　1. If time permits, we'll go fishing together. 　　(如果有时间的话，我们就一起去钓鱼。) 　　如果假设的情况与事实相反，则为"虚拟条件句"。如： 　　1. If it had rained yesterday, we would have stayed at home. 　　(如果昨天下雨的话，我们就会留在家里。) 　　这回我们要谈的就是关于"虚拟条件句"的一些句型。 　　* 这种句子一般由"从句"(Subordinate Clause)和"主句"(Main Clause)组成。如上 　　例： 　　If it had rained yesterday, we would have stayed at home. 　　"If it had rained yesterday" 就是"从句";"we would have stayed at home" 则为"主句。 　　* 无论"从句"或"主句"的谓语都要用虚拟语气。它们所用的动词有三种时态(Tenses)，就是：现在时态、过去时态、将来时态。 　　* 句型： 　　8.1　与现在事实相反的假设(事情的发生都在同一时

www.ertong6.com 间内): 　　从句：if + 主语 + 动词的过去式(be 用 were) + …… 　　主句：主语 + would (should, could , might) + 动词原形 + …… 　　1.If I were you, I would go with him. 　　(从句 If I were you, 主句 I would go with him.) 　　2.If I were you, I should buy it. 　　(从句用过去式动词were，主句用动词原形 buy) 　　3.If I had time, I would study French. (如果有时间，我会学习法文。) 　　(从句用过去式动词had，主句用动词原形 study) 　　4. If she knew English, she would not ask me for help. (如果她懂英文，她就不必要我帮了。) 　　(从句用过去式动词knew, 主句用动词原形ask) 　　注意：如果动作在进行中，主句要用："主语 + would be + 进行式动词 + ……" 　　5. If they were here, he would be speaking to them now. 　　(从句用过去式动词were, 主句用 would be speaking) 　　8.2　与过去事实相反的假设(假设从句的事实为过去的事)： 　　从句：If + 主语 + had +过去完成式动词 + …… 　　主句：主语 + would (should, could, might) + have +过去完成式动词 +…… 　　1. If you had studied harder last term, you could have passed exam. 　　(从句动词用had studied, 主句动词用have passed) 　　如果你在上个学期用功一些，你就会在考试中过关了。 　　2. If you had taken my advice, you wouldn't have failed in the exam. 　　(从句动词用had taken, 主句动词用have failed) 　　如果你当时听从我的劝告的话，你就不会在考试中失败了。 　　3. If you had got up earlier, you could have caught the train. 　　(从句动词用had got up, 主句动词用 have caught) 　　如果你起身得早一点，你就会赶得上火车了。 　　4. If it had snowed, I would have skied in the park. 　　(从句动词用had snowed, 主句动词用 have skied) 　　如果下雪的话，我就可在公园里滑雪了。 　　注意：如果动作在进行中，主句要用："I主语 + would + have + 完成进行式动词+…… 　　5.If they had been here, he would have been speaking to them. 　　(从句动词用had been, 主句动词用 have been speaking) 　　8.3　与将来的事实可能相反(对将来的事实实现的可能性不大)： 　　从句：If + 主语 + should (或were) + 动词原形 +…… 　

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