一、语气的定义和种类
l. 语气:语气是动词的一种形式,它表示说话人对某一行为或事情的看法和态度。
2. 语气的种类
(1)陈述语气:表示动作或状态是现实的、确定的或符合事实的,用于陈述句、疑问句和某些感叹句。如: We are not ready. 我们没准备好。What a fine day it is!多好的天气啊!
(2)祈使语气:表示说话人的建议、请求、邀请、命令等。如:Open the door, please.请打开门。
(3)虚拟语气:表示动作或状态不是客观存在的事实,而是说话人的主观愿望、假设或推测等。如: If I were you, I should study English. 如果我是你,我就学英语了。May you succeed! 祝您成功!
二、虚拟语气在条件从句中的用法
条件句有两类,一类是真实条件句,一类是虚拟条件句。如果假设的情况是有可能发生的,就是真实条件句。在这种真实条件句中的谓语用陈述语气。如: If it doesn't rain tomorrow, we will go to the park. 如果明天不下雨,我们就去公园。
如果假设的情况是过去或现在都不存在的,或将来不大可能发生的,则是虚拟条件句。如: If he had seen you yesterday, he would have asked you about it. 如果他昨天见到你,他会问你这件事的。(事实上他昨天没见到你,因此也未能问你这件事。)
在含有虚拟条件句的复合句中,主句和从句的谓语都要用虚拟语气。现将虚拟条件从句和主句的动词形式列表如下:从 句 主 句
与现在事实相反 动词的过去式(be的过去式一般用were) would/ should/ could/ might + 动词原形
与过去事实相反 had + 过去分词 would/ should/ could/ might + have + 过去分词
与将来事实相反 动词过去式,should + 动词原形,were to + 动词原形 would/ should/ could/ might + 动词原形
注:主句中的should只用于I、we,但在美国英语中,should常被would代替;从句中的should可用于各种人称。
l. 表示与现在事实相反的假设和结果。如:If my brother were here, everything would be all right. 要是我哥哥在这儿,一切都没问题了。
2. 表示与过去事实相反的假设和结果。如:If you had taken my advice,you wouldn't (couldn't) have failed in the exam. 如果你按照我的建议去做,你一定不会(不可能)考试不及格。
3. 表示与将来事实可能相反的假设和结果。如:If it were Sunday tomorrow, I should (would, could, might) go to see my grandmother. 如果明天是星期天,我就(可能)去看望我奶奶。If it were to snow this evening, they would not go out. 如果今晚下雪,他们将不出去了。
4. 有时条件从句中的动作和主句中的动作发生的时间不一致(表示错综时间的虚拟语气),这时动词的形式要根据它所表示的时间加以调整。例如: If you had listened to the doctor, you would be all right now. 如果你当初听了医生的话,身体现在就好了。(从句动作指过去,主句动作指现在)
5. 虚拟条件句可以转换成下列形式
(l)省略连词if.在书面语中,如果虚拟条件从句中有were,had 或 should,可以把if省略,把这几个词放到主语之前,构成主谓倒装。例如:Should he come (If he should come), tell him to ring me up. 他要是来了,让他给我打个电话。Were I you (If I were you), I would not do it. 我要是你,就不做这事。
(2)用介词短语代替条件状语从句。有时假设的情况并不用条件从句表示出来,而是通过介词短语来表示。如:Without air (If there were not air), there would be no living things. 如果没有空气的话,就不会有生物了。But for your help (If it hadn't been for your help) I couldn't have done it. 要是没有你的帮助,我就不可能完成这件事。
假设的情况有时可以通过上下文或其他方式表现出来。如:I was busy that day. Otherwise I would have gone there with them. (If I hadn't been busy that day, I would have gone there with them.) 我那天很忙,否则,我就和他们一起去那儿了。(如果我那天不忙的话,我就……);I would have finished the work, but I have been ill. (If I hadn't been ill, I would have finished the work.)我本来该完成这项工作的,但我生病了。(如果我没生病的话,我就会完成……)
6. 省去条件从句或主句:表示虚拟语气的主句或从句有时可以省略,但其含义仍可以推知。
(1)省去条件从句。如:You could have washed your clothes yourself. 你本可以自己洗衣服的。省去了"If you had wanted to"(事实是:你自己没洗衣服,因为你不想洗。)
(2)省去主句(常用以表示愿望)。如: If my grandmother were with me! 如果我的祖母与我在一起多好啊!(事实是:祖母已不在世。);If only she had not left! 如果她没走就好了!(事实是:她已经走了。)
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