关于虚拟语气的句子辨析。

虚拟是在“假设”的条件下使用的，而真实条件句是有这样的情况。具体情况讲解部分：

1.辨别if 引导真实条件句和if引导的虚拟条件句的区别
If he has time, he will go with us.= Probably he has time and will go with us.
If he had time, he would go with us.=But in fact he has no time.
2.虚拟条件句中主句和从句的谓与动词构成形式如下表

if条件句中的谓与动词
主句的谓与动词
与现在的事实相反
1. 行为动词用did 形式
2. be动词用were
Should/would/could/ might + 动词原形
与过去的事实相反
had + done
Should/would/could/ might + have + done
与将来的事实相反
1. 行为动词用did
2. should + 动词原形
3. were to + 动词原形
Should/would/could/ might + 动词原形

这个题目出的不好，但是可以看出题者的用心，我这里有以前答得一片文章你看下，绝对能回答你的问题。
http://zhidao.baidu.com/question/487697541.html?sort=6&old=1&afterAnswer=1#reply-box-1229240955