if引導的虛擬條件句【教學類別】

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1、與現(xiàn)在事實相反：與現(xiàn)在事實相反：if條件句用一般過去時（動詞be用were），主句用would(should/could/might)+動詞原形、帶、帶if if的虛擬條件句的虛擬條件句與將來事實相反與將來事實相反(推測將來推測將來)：if 條件句中用過去時，或should/were to+動詞原形，主句用would(should/could/might)+動詞原形。與過去事實相反：與過去事實相反：if 條件句中用過去完成時，主句用would（should/could/might）+have+過去分詞。條件從句條件從句結果主句結果主句與現(xiàn)在事實相反與現(xiàn)在事實相反If +主語主語+過去式過去式

2、主語主語+would/should/could/might do 與將來事實相反與將來事實相反If+主語主語+過去式過去式主語主語+would/should/could/might dowere to do/should/could do)與過去事實相反與過去事實相反If+主語主語+had+過去分詞過去分詞主語主語+would/should/could/might have doneIf引導虛擬條件句中的謂語動詞變化 He must have had an accident,or he then_.Awould have been here Bshould be here Chad to be here Dwould be there答案為A。or 在這里隱含了與過去事實相反的虛擬語氣，表示if he had not had an accident,所以其后的主句用would have done 而不用其它的。