【北师大版】2016高考英语一轮复习讲练精品学案：选修7 Unit 21 Human Biology_高考复习指南

　　if从句谓语用had done(过去完成时)假设过去的情况；主句谓

　　语用would / could /might ＋ do，讲述现在的情况。

　　【典型例句】

　　He would not stand here talking to you if he had died in the car accident.

　　他要是已经在车祸中死了的话，他就不会站在这儿跟你说话了。(事实：他在车祸中没死，现在在跟你说话)

　　If you had finished your homework yesterday，you could go out to play now.

　　要是你昨天就把作业做完的话，现在不就可以出去玩了吗？(事实：昨天没把作业做完，现在不能出去玩)

　　即学即用

　　If you ________ my advice，you would not feel sorry now.

　　A．followed

　　B．had followed

　　C．was following

　　D．would follow

　　解析：本题考查if引导的错综条件句。句意：如果你当初听我的建议的话，你现在就不会后悔了。(事实：当初没有听我的建议，所以现在后悔了。)

　　答案：B

　　4．Many people fear it could be the next global epidemic，

　　especially as scientists who studied tissue from the bodies

　　of people who died of the 1918 Spanish Flu proved that

　　Bird Flu is a modern adaptation of the same virus.

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