Had known it earlier,I would not have gone back!在过去之前知道得早点 应该是过去完成时阿！

Had known it earlier,I would not have gone back!在过去之前知道得早点 应该是过去完成时阿！ If I had known it earlier,I would have made preparations.问：我知道是虚拟语气,也知道翻译,我就问：主句I would have made preparations是什么时态,为什么要这样,有什么规律? I wish I had known earlier that you could have acaree ,even if you are not top of the class . I wish I'd known about that rule earlier 其中'd是哪个单词?如题,would?had? had i known it ,i would have..HAD在句首? 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 . the　student　asked　her　professor　if　he　would　have　gone　on　the　space　ship　＿＿＿earlier．A．if　he　knowsB．if　he　knewC.　he　had　knownD．had　he　known Stave said that if he had known how it worked,he would have been told He thought I had known the fact.But a____-,I knew nothing about it. I didn't continue to see the movie because I had known the [e ] of it 英语翻译If my father had known of it he would have died a second time. ------------for the heavy rain.i should have been here earlier A if it were not B were it notC had it not been D if it wasn't It was a l__ earlier. They had the gift of love .And it's never known where it will land.是什么意 It is well-known it's well known 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：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