If I had known that,I could have helped you.had和known怎么都是过去式,have在这里是什么意思,为什么它不用过去式

If I_____that erlier,I wouldn't have made that mistake.A.know B.had known C.have known D.knew If I had known that,I could have helped you.had和known怎么都是过去式,have在这里是什么意思,为什么它不用过去式 I wish I had known earlier that you could have acaree ,even if you are not top of the class . If I ________ that she was ill,I would have gone to see her．A.knew B.know C.have known D.had known 英语一句话的理解问题 if you'd said that befor i'd have knownif you'd said that befor i'd have known 两个是不是、都是had I wish I _____ the play at the little theatre.Well,if I had known that ,I would have given youI wish I _____ the play at the little theatre.Well,if I had known that ,I would have given youmy ticketA have senn B saw C see D had seen 为什么选D D不 have had done与had have done区别——，I'd have told you.A.If I would have known B.If I had have known C.Had I known D.Should I know If it had been known that,why the need for and at the beginning .If it had been known that,why the need for and at the beginning . 英语虚拟语气的一道题if i had known that,i____so.A.wouldn't doB.wouldn't have done选哪个,请说明理由. Stave said that if he had known how it worked,he would have been told 假如早知道我是个天才 IF I HAD KNOWN I WAS A GENIUS怎么样 1,____ ,I would have phoned you ,a,if I knew it b,had I known it c,if I know it d,did I know it.2 ,it was because of bad weather_____ the football match had to be put off.a,so b,so that c why d,that 3,scarcely____ the room ___ the phone rang.a,I had 英语：1.I would have phoned you ,if I ___ time.( )A.had had B.have had C.had2.If I __ her tomorrow,I would pass your note to her.( )A.see B.shall see C.saw3.__,I'd have told you.( )A.If I would have known it B.If I had known it C.Had I known it4.T if only i had knew that at that moment 英语翻译Today we buried our 20-year-old son,Jim.He was killed in a motorcycle accident on Friday night.How I wish 1 had Known when I talked to him last that it would be the last time:If I had only known 1 would have said “Jim,I love you and I if i knew that i had taken out it 求3.倒装、省略、强调结构相关?倒装、省略、强调结构练习21.Here _______ now.A.come David B.David comes C.David came D.comes David22.______ that you were ill,I would have come home earlier.A.I had known B.If I know C.Had I known 英语翻译I had not known him for 20 years without learning that he always .