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与过去事实相反：if 条件句中用过去完成时，主句用 would（should/could/might）+have+过去分词。
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If引导虚拟条件句中的谓语动词变化
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与将来事实相反时从句中的三种谓语 v变形：
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• 如果她在这里，她也同意的。 • If she were here, she would agree too. • →Were she here, she would agree too. • 假若明天下雨，我们只好推迟这场比赛。 • If it should rain tomorrow, we should have to put off the match. • →Should it rain tomorrow, we should have to put off the match.
certainly go to the movies with you. • If you could bear the loneliness, you might succeed.
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与将来事实相反(推测将来)：if 条件句中用过去时， 或 should/were to+ 动 词 原 形 ， 主 句 用 would (should/could/might)+动词原形。
虚拟语气 -------- if 引导的虚拟条
件句
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Ⅰ、带if的虚拟条件句
与 现 在 事 实 相 反 ： if 条 件 句 用 一 般 过 去 时 （ 动 词 be 用 were），主句用would(should/could/might)+动词原形
eg: • I am sorry I am very busy just now. If I had time,
• He must have had an accident, or he
then____.
• [A]would have been here
[B]should be here
• [C]had to be here
[D]would be there
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