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句主句為將來時(shí),從句用一般現(xiàn)在時(shí)。a. 同現(xiàn)在事實(shí)相反的假設(shè)。) If it had rained last night (過去), it would be very cold today (現(xiàn)在).4 虛擬條件句的倒裝 虛擬條件句的從句部分如果含有were, should, 或had, 可將if省略,再把were, should或had 移到從句句首,實(shí)行倒裝。 If I were you, I would go to look for him. 如果我是你,就會(huì)去找他。如我們可說 Were I not to do., 而不能說 Weren39?!?The guard at gate insisted that everybody obey the rules. 判斷改錯(cuò):?。ㄥe(cuò)) You pale face suggests that you (should) be ill. (對(duì)) Your pale face suggests that you are ill. (錯(cuò)) I insisted that you ( should) be wrong. (對(duì)) I insisted that you were wrong.3)在表語從句,同位語從句中的應(yīng)用 在suggestion, proposal, idea, plan, order, advice等名詞后面的表語從句、同位語從句中要用虛擬語氣,即(should)+動(dòng)詞原形。t said that. 他希望他沒講那樣的話。If only也可用于陳述語氣。8 It is (high) time that It is (high) time that 后面的從句謂語動(dòng)詞要用過去式或用should加動(dòng)詞原形,但should不可省略。t have done表示: 過去不必做某事, 但事實(shí)上做了。t have walked back home. 約翰開車去車站接瑪麗,所以她本不必步行回家了。t have hurried C. must not hurry D. needn39?!ustn39。t have done, 不可能已經(jīng)。needn39。)典型例題 There was plenty of time. She ___.A. mustn39。t need to walk back home. 約翰開車去車站接瑪麗,所以她不必步行回家了。t need to do表示: 過去不必做某事, 事實(shí)上也沒做