The reason why...is/was that 的意思是什么呢？优朗英语全日制英语培训的许老师告诉我们是“……的原因是……”的意思。
句型解析：
1.说明某件事情发生的原因
这个句型表示“……的原因是……”的意思。这个句型结构比较复杂：句子的主语是the reason,后面有两个复合句。一个是关系副词why所引导的从句，修饰句子的主语是the reason。一个是that所引导的从句。that不能省略。
例句：
The reason why she was fired was that the boss was not satisfied with her job.
她被炒鱿鱼的原因是老班对她的工作不满意。
2.说明事情发生的原因
另外，这个句型还可以简化为：The reason is/was that...。也就是把这个句中why引导的从句去掉。
例句：
The reason is that I took a wrong bus.
（我迟到的）原因是我坐错车了。
情景会话：
You are late, Dennis.
The reason(why I'm late) is that I took a wrong bus.
丹尼斯，你迟到了！
我迟到的原因是我做错车了。
Could you tell me the truth, please?
Well, the reason why he wants to leave you is that he is dying.
请你告诉我真相，可以吗？
好吧。他想要离开你的原因是他快要死了。
The reason why she was fired was that the boss was not satisfied with her job.
To be frank, she is not fit for the job.
她被炒鱿鱼的原因是老板对她的工作不满意。
老实说，这个工作不适合她。
The reason why I had a fight with Kim was that she cheated!
Well, she got what she deserves.
我和金吵架的原因是因为她作弊！
好吧，她罪有应得。
