2016屆高考英語語法知識情態動詞和虛擬語氣復習
過去分詞表示虛擬條件given more attention, the tree could have grown better.
如果多留心的話，這樹本來可以長的更好。
副詞otherwise表示虛擬條件i was too busy at that time.otherwise,i would have called you.我當時太忙，否則我就給你打電話了。
連詞but連接的句子表示虛擬條件he _____fatter but he eats too little .a. would become b. would have become c. must become d. must have become
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狀語從句as if/as though引導的狀語從句中動詞用did或had＋done或would/could/might＋do。注意：as if/as though引導的狀語從句中也可以用陳述語氣：當說話者認為所述的是真實的或極有可能發生或存在的事實時：it sounds as if it is raining.聽起來像是在下雨。
he talks as if he is drunk.從他談話的樣子來看他是醉了。①與現在事實相反he talks as if he knew where she was.②與過去事實相反he talks about rome as if he had been there before.③與將來事實相反he opened his mouth as if he would say something.in order that/so that引導的狀語從句中動詞用can/could/may/ might/ would等+doturn on the light so that we can see it clearly.
賓語從句demand, suggest, order, insist后接的從句中動詞為should+dohe suggested that we not change our mind.wish后的從句中分別用過去式，過去完成式和should/would+do表示與現在，過去和將來情況相反i wish i could be a pop singer.i wish i would have gone to shanghai last month.
主語從句在it is necessary / important / strange that…it is suggested / demanded/ ordered / requested that…等從句中，謂語動詞用should+doit is strange that such a person should be our friends.
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句型中it is time that…句型中動詞用過去式或should+doit’s high time that we left/should leave.would rather所接的從句中動詞用過去式或者過去完成式i would rather you stayed at home now.if only句型中動詞常用過去式或者過去完成式，表示強烈的愿望if only our dream had come true!