2019学年度北师大版选修七Unit 21 Section Ⅷ Grammar学案设计
单元语法项目(一)--条件句和混合条件句
语法图解
探究发现
A.①If current Olympic champion Marion Jones took such drugs, she would probably have broken that world record more than once.
②If Peter was a more skillful player, he would have scored more points.
B.③Ben Johnson would still be the 100 metres world record holder, if he had not been caught.
④If he had broken that record, he would be a worldfamous runner now.
[我的发现]
(1)A组句子中,从句表示与现在事实相反的假设,而主句表示与过去事实相反的结果。由此可知混合条件句可以用来谈论"非真实的、常常是想象中的现在状态,可能对过去有影响",其构成形式是:"if+主语+动词的过去式,主语+would_have_done"。
(2)B组句子中,从句表示与过去事实相反的假设,而主句表示与现在事实相反的结果。由此可知混合条件句可以用来谈论"想象中的过去事件可能对现在有影响",其构成形式是:"if+主语+had_done,主语+would+动词原形"。
在英语中,我们一般把条件句分为两种,即真实条件句和非真实条件句。非真实条件句亦可称为虚拟语气。虚拟语气表示说话人的愿望、假设、猜测或建议,而不表示客观存在的事实。
一、if条件状语从句中的虚拟语气