高中英语40个必考句型

[例句]It's timethat you went to school.=It's time that you should go to school.lt's hightime that we did something to improve our environment..该是我们为环保做些事情了。I think it'shigh time that she made up her mind.我想她该拿定主意了。句型5情态动词+动词不定式完成结构的用法could havedone"本来可以..."（表示过去没有实现的可能）。might havedone"本来可能...；本来应该或可以做某事"（实际没有发生；含有轻微的责备语气。should/oughtto have done"本来该做某事"（而实际未做）shouldnot/.ought not to have done"本来不该做"（实际却做过了，含有责备语气）needn't havedone"本来不必做"（但是已经做过了）would ratherhave done"当时宁愿做了某事"（实际没有做过）；否定式would rather not havedone表达相反意思，两者都有表示"后悔"之意。句型6as,though,although引导的让步状语从句。[注意]although位于句首；though位于句首或句中；as位于句中=though。它的词序是把句中强调的形容词、副词、动词或名词放在连词前。[参考倒装结构]请注意下列句式的变化：[例句]1.Although/Though I'm young,I already know what career I want to follow.-Youngas/though I am,I already know what career I want to follow.我虽然年轻，但我已经明白我应该追随什么样的事业。2.Although/Though I respect him very much,I cannot agree with his idea.-Muchas/though I respect him,I cannot agree with his idea.虽然我很尊重他，但是我不同意他的观点。3.Although/Though he is a child,he knows a lot of Chinese characters.→Child(省略冠词)as/though he is,he knows a lotof Chinese characters.他虽然还是个孩子，却认识了许多汉字。