1、在虛擬條件句中：(一) 三種基本形式：1) 與現(xiàn)在事實相反的假設(shè) IfV.ed,  .wouldshouldmightcould+V If  you knew everything now, you would not be so angry with him. 2) 與將來事實相反的假設(shè) IfV.ed,  .wouldshouldmightcould+V Should+V Were to+V    If he had enough money next year, he might go abroad soon. 3) 與

2、過去事實相反的假設(shè) If + had+ V.ed,  .wouldshouldmightcouldIf I had known his number, I might have telephoned him yesterday.   For examples:1. If you had taken my advice, you would not have failed in the experiment so many times. 2. They would have got some tickets that night if they had got to the

3、tickets office early. 3. If you had spoken to him last time you saw him, you would know what to do now. 4. If I were you , I would not have made so many mistakes last night (二) 幾種特殊形式：1）省略“if”引起倒裝: 將were/had/should提前1If I were you, I might choose this one. Were I you, I might choose this one. 2If I

4、had known his number, I might have telephoned him yesterday. Had I known his number, I might have telephoned him yesterday. 2）otherwise, but for, without, but that, except for, only , but, or 1. Without electricity we would do nothing. 2. But for your help, we could not have finished the task so wel

5、l. 3. I caught her by the hand. Otherwise she would have fallen into the sea. 4_he was seriously ill, I would not have told him the truth. a ) If I knew            b) if I know   c)  Had I known       

6、; d) Did I know 5             We could not have fulfilled the task in time if it -for their help. a ) was not            b) is not  c) had not been    d) has not bee

7、n 3）在表示祈愿的動詞wish后： 對現(xiàn)在的虛擬要用； 對將來的虛擬要用could/might/would /should+V; 對過去的虛擬要用had+或could/might/would/shouldhave+；如：IwishIhadboughtthehouse. Iwishyoucouldhavepassedthetest. Hewishesheweremyage. Wewishyouwouldtryagain. The boy wishes he had wings. How she wishes she hadnt left home! 4）在Its (high) time結(jié)構(gòu)后：

8、 Its high time you left home for work. Its time for you to leave home to work.5）在d rather后：would rather , would sooner, had rather也用來表達主觀愿望, 謂語動詞用過去式表示現(xiàn)在或?qū)恚眠^去完成式表示與過去事實相反。表示"寧愿做什么"或"對過去做的事的懊悔"。Wed rather you lived far away from us. Wed rather we hadnt been there before. 6）在表示祈愿

9、的if only后：謂語動詞用過去式或過去完成式(謂語動詞與wish賓語從句的虛擬形式相同).IfonlyyouhadnttoldLindawhatIsaid. If only I knew how to do it. If only they hadnt made such a mistake. 7）在as if, as though 引導(dǎo)的從句中與wish后的從句基本相同He talked about the moon as though he had been there. 8）在表示建議、命令、要求、忠告等動詞的后面的賓語從句中的虛擬語氣 (should)V. 表示"要求&q

10、uot;的：ask, desire, request, demand, require, beg表示"提議、勸告、建議"的：move, propose, suggest, recommend, advise, vote表示"決定、命令"的：decide, order表示"主張"的：maintain, urge表示"同意、堅持"的: insistThe doctor suggested that he (should) try to lose his weight.He insisted that we (shoul

11、d ) tell him the news.9）It iswas+adj.p.p+that(should)V. necessary, desirable, essential, advisable, important, requested, suggested, insisted There was a suggestion that Browns (should) be dropped from the team. It  is most desirable that he-for the information by himself with a few clicks online. A .search    b. searched  C .has searched    d. will searched 10）lest, for fear that, in case引導(dǎo)的目的狀語從句, 表示&