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16.3 混合條件句
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  主句與從句的動作發(fā)生在不同的時間,這時主,從句謂語動詞的虛擬語氣形式因時間不同而不同,這叫做混合條件句。
   If you had asked him yesterday, you would know what to do now.
  (從句與過去事實相反,主句與現(xiàn)在事實相反。)
   If it had rained last night (過去), it would be very cold today (現(xiàn)在).














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