40 条件句虚拟语气：假的真不了（1）

虚拟语气一般用来表示三种概念：假设、建议和主观愿望。

先来看第一种：表示假设的虚拟语气。该类型虚拟语气一般出现在 if 引导的条件句中，表示与现实相反的情况或偶然实现的可能性。主要有以下三种情况：

1. 与现在情况相反

动词构成：if 条件句动词用过去式(be 动词只能用 were），主句动词用 would (should, might...) + 动词原形，举例：

If I were you, I would refuse him. 如果我是你，我会拒绝他。

2. 与过去情况相反

动词构成：if 条件句动词用 had + 过去分词，主句动词用 would (should, might...) + have + 过去分词，举例：

If I had had time, I would have finished the work. 我当时要有时间，就能完成那项工作了。

3. 与将来情况可能相反

动词构成：if 条件句动词用 were to / should + 动词原形，主句动词用 would (should, might...) + 动词原形，举例：

If he should see me, he would know me. 假如他看见我，就会认识我。