12. or/otherwise 由后面句中的谓语would be可知, 前面用or或otherwise (否则)来表示虚拟条件。 13. Without 由后面的would die可知，填without表示虚拟条件。 14. asked 在would rather后的从句中，用一般过去时表示现在或将来。 15. had finished 表示与过去事实相反的情况，虚拟条件句的谓语用过去完成时。 三、单句改错

　　1. How I wish there are 28 hours a day so that I had more time for fun. are→ were

　　与现在事实相反或不可能实现的愿望，故用一般过去时。

　　2. Had he worked hard years ago, he would become very rich today.

　　在become前加 have

　　前句相当于If he had worked hard years ago, 与过去事实相反的假设,主句谓语要用would have done。句意：如果他几年前就努力工作，他现在也已经变得富有了。 3. If I were a boy again, I will remember that a good skater never tries to skate in two directions at once.

　　will→ would

　　虚拟条件句是与现在事实相反的情况，主句谓语用would do。

　　4. But the fact that China are also affected by the global economic crisis, we would have fewer workers now. 在But后加for

　　因but for(如果没有，要不是)是固定短语，常与虚拟语气连用。 5. It might have been done better if you have been more careful.

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