1、虛擬語氣如何用(1)對現(xiàn)在狀況的虛擬對現(xiàn)在狀況的虛擬，條件句中謂語動詞用一般過去時，主句用 would/should/might/could+動詞原形。(2)對過去狀況的虛擬對過去狀況的虛擬，條件句中謂語動詞用過去完成時，主句用 would/should/might/could + have+過去分詞”。(3)對將來狀況的虛擬對將來狀況的虛擬，條件句中謂語動詞可用should do, were to do或動詞的過去 式三種形式表示，但意義略有不同。should表示的可能性比擬大，動詞過去式的可能 性次之,were to do的可能性比擬小。主句謂語動詞用nwould/should/might

2、/could + 動詞原形。(4)錯綜時間條件句有時條件從句謂語動詞表示的動作和主句謂語表示的動作發(fā)生的時間不一致，這類 句子稱為錯綜時間條件句。此時主從句動詞的形式應通過各自所表示的時間開展調(diào)整。If you had taken my advice then, you wouldnt be in trouble now.假如當時聽我勸，你現(xiàn)在就不會有麻煩了。( if條件句是對過去的虛擬，故用過去 完成時，而主句是對現(xiàn)在的虛擬，故用would+動詞原形形式。)(5 )表示建議、命令、要求、堅決做等動詞后的賓語從句常用(should+) 動詞原形(6) wish后的賓語從句wish后的賓語從句用

3、T殳過去時表示現(xiàn)在的狀況，用過去完成時表示過去的狀況, 用would/could do表示將來的狀況。(7 ) would rather后的賓語從句would rather后的從句常用一般過去時形式，表示現(xiàn)在或?qū)淼臓顩r；用過去完 成時，表示過去的狀況(8 ) It is/was important (necessary, appropriate, proper, right, essential, vital, etc.) that英語虛擬語氣有什么用法一.定義：動詞虛擬語氣表示說話人的愿望，假設，猜想，建議，請求，意圖，設想等 未能或不可能成為事實的狀況，或者在說話人看來實現(xiàn)可能性很小的狀

4、況，而不表示客 觀存在的現(xiàn)實二.虛擬語氣的表現(xiàn)形式：根據(jù)句中謂語動詞的特殊形式來表現(xiàn).這些特殊形式與謂 語動詞的某些時態(tài)相同，但它們只表示語氣，而不表示時態(tài)，但含有一定的時間定義虛擬語氣的用法一.虛擬語氣在簡單句中的用法：謂語動詞用原形或may +動詞原形.表示祝愿Long live our country.May you succeed.May you be happy all your life.表示命令a. Everybody leave the room.二.虛擬語氣在非真實條件句中的用法：(使用虛擬語氣的含條件句的復合句稱為真 實條件句).表示與現(xiàn)在事實相反的狀況時，if從句的謂語用

5、動詞的過去式（be動詞的過去式 多用were,而不用was）,主句的謂語用should / would / could / might +動詞原形 （should多用于第一人稱,would多用于二三人稱,could / might可用于全部人稱）If I had more time, I should study computer better.If he were not so busy, she would attend the meeting this afternoon.If they didn t take exercises every day, they wouldn t be

6、so healthy.If you went to bed earlier, you would not be so sleepy in the morning.If she invited me, I should go to the party.表示與過去事實相反的狀況時，if從句的謂語用had done形式，主句的謂語用 should / would / could / might + have done 的形式If she had invited me yesterday, I should have gone to the party.I would have checked my

7、paper again if I had had more time at yesterday7 s exam.If you had taken the teacher s advice, you would not have failed in the exam.表示與將來事實相反的狀況時，if從句的謂語形式是：.完全動詞過去式（be的 過去式通常用were）;.should +動詞原形；.were to do.其中，種狀況都含有 出乎意料之外之意；主句的謂語的形式是:should/would /could/ might +動詞原形If she should invite me tomorr

8、ow, I should go to the party.If it rained / should rain / were to rain tomorrow, our picnic would be put off.If I saw him tomorrow, I would pass your note to him.I might come back if I were to miss the train.三,虛擬語氣在非真實條件句中用法的幾個變體：L條件從句省略if：在書面語中，假如條件從句中的謂語中有were, had, should等 詞，可將if省略，而把were, had, s

9、hould放到句首Were I you (=If I were you )z I would get up early very early.Had you arrived (=If you had arrived ) at the station ten minutes earlier yesterday, you could have caught the train.省略條件從句或主句，省略局部的含義仍有所表達.省略主句時，表示己不能實 現(xiàn)的愿望You could have done it yourself (if you had wanted to).I wouldn t smoke

10、(if I were you).If my old friends were with me!(要是老朋友和我在一起該多好啊)If you could have seen the wonderful film!.主從句時間不一致時，主從句謂語動詞的形式取決于要表示的詳細時間You would speak English well if you had practised speaking it every day.If she hadn, t trained so hard, she wouldn, t be able to run so fast.4.假設的條件不以條件從句，而以別的方式如介

11、詞短語、從句等表達出來，這種句子 稱為含蓄條件句What would you do with a million dollars?Without music, the world would be a dull place.We could have done better with more money.He would have given you more help, but he has been so busy.四,虛擬語氣在as if /though從句中的用法：1.表示與現(xiàn)在事實相反或?qū)ο嘣跔顩r有所懷疑,as if /though從句謂語用過去式He speaks English

12、 so well as if she had studied English in England.She looked as if she were ill.2.表示與過去事實相反的狀況,as if/though從句謂語用過去完成式a. The machines operated as if it had been repaired.虛擬語氣在含even if /though從句的復合句中的用法：在此類復合句中，假設表示與事實相反，可用虛擬語氣形式.主從句的謂語動詞形式 與非真實條件句相同a. Even if I were richz I would work.虛擬語氣在主語從句中的用法：假

13、如表示說話人的看法，想法或意見，在句型It is / was + adj. + that從句中，主 語從句中可用虛擬語氣.主語從句中謂語動詞用should do表示現(xiàn)在或?qū)頎顩r，用 should have done表示過去狀況It is necessary that you should clean the lab before you left.It is important that you should take the doctor7 s advice.It was very strange that he should have left without say goodbye.虛

14、擬語氣在賓語從句中的用法：1.在wish的賓語從句中，通常表示不可能實現(xiàn)或沒有實現(xiàn)的愿望，常用虛擬語氣.wish的賓語從句用過去式，表示現(xiàn)在或?qū)頉]有實現(xiàn)或不可能實現(xiàn)的愿望I wish I knew the result of the match now.I wish it were spring here all the year round.I wish I could help you.I wish I were young.wish的賓語從句用過去完成式，表示過去沒有實現(xiàn)或不可能實現(xiàn)的愿望We wish we had got the film tickets last night.I

15、wish you I had met him yesterday.Wish的賓語從句假設用would,那么一般表示請求，對現(xiàn)狀不滿或期待未來有所改 變I wish the prices would come down.I wish you would help me.I wish he would be more careful.We wish you would spend the holiday with us.2.在動詞 suggest （建議），advise 健議）,demand （要求），require （要求），order （命令），insist （堅持）后的賓語從句中，謂語動詞常

16、用（should ）+動詞原形的虛擬語氣形 式I suggested that we should go there at once.I demand that he should answer me at once.The doctor insisted that the patient should stay in bed for two weeks.The officer ordered that the soldiers should stop playing.與名詞 suggestion 建議 / advice 建議 / demand 要求 / request 要求 / order

17、命令有關的從句（包括同位語從句和表語從句等）中的謂語也用（should ） +動詞原形The black people made a strong demand that the government ( should ) take steps to change the unfair situation.Their demand is that the government should take steps to change the unfair situation.I was BilT s suggestion that everybody should have a map.His

18、suggestion was that everybody should have a map.八.虛擬語氣用在句型：It is time that(該做某事了)中：that從句中的謂語動詞用過 去式a. It is time we got up.九.虛擬語氣用在if only引導的感嘆句中：表示但愿，要是就好了，其中謂語形式與 wish的賓語從句相同If only he didn, t drive so fast! ( =1 wish he didn t drive so fast.)If only he had taken the doctor7 s advice. ( =1 wish he had taken th