如果我懂阿拉伯语，那个阿拉伯人就不会误会我了。

If he were here，we would congratulate him on his promotion.

如果他在这里，我们就祝贺他晋升了。

(2)与过去事实相反的虚拟语气

条件句用"had＋过去分词"；主句用"would/could/might/should ＋ have＋过去分词"。

If I had been invited to the wedding reception，I could have taken a few photos with the bride.

如果被邀请参加那次婚宴，我可能就会和新娘一起拍几张照片了。

She would/might have come for the celebration if she hadn't been so busy.

要是不那么忙，她就来参加庆典了。

If I hadn't taken your advice，I would have made a big mistake.

如果没有接受你的建议，我就会犯一个大错误。

(3)与将来事实相反的虚拟语气

条件句用动词的过去式、"should ＋动词原形"或"were to ＋动词原形"；主句用"would/could/might/should ＋动词原形"。

If it should rain，we wouldn't go out.

如果天下雨，我们就不出去。

If he should study/were to study/studied hard，he would live up to his parents' expectations.

如果他努力学习，就不会辜负父母的期望。

三、if条件句转换成倒装句

if虚拟条件句中含有should，were，had时，可把这些词移至主语前构成倒装句并省略if。例如：

If I were in school again，I would work harder.可转换为：Were I in school again，I would work harder.如果我重返校园的话，我会更努力地学习。

If my lawyer had been here last Saturday，he would have prevented me from going. 可转换为：Had my lawyer been here last Saturday，he would have prevented me from going.如果我的律师上星期六在这里的话，他就会阻止我去。

If there should be a meeting tomorrow，I would come. 可转换为：Should there be a meeting tomorrow，I would come.如果明天有会议的话，我会来的。