特黄特色三级在线观看免费,看黄色片子免费,色综合久,欧美在线视频看看,高潮胡言乱语对白刺激国产,伊人网成人,中文字幕亚洲一碰就硬老熟妇

16.3 混合條件句
?
  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).














 學(xué)習(xí)啦--英語語法大全