题目内容：

关于the reason why..is because/that句型的终极疑问
大家都知道中国老师教的都是the reason why...is后面一定要接that引导表语从句
但是我来加拿大这么久了,所有人说的都是the reason why...is because...,我曾经问过一个老师为什么不用that?他回答我说他never heard有人用that,我当时也没深追究
但是今天老师改我论文的时候,特地把我的that改成了because,我就拿着文章找老师理论,结果这个老师也是回答我说“从来没有人把the reason why和that collocate”
这个问题让我十分头疼,按语法来说,because明明是一个连词,怎么能放到be动词之后呢?虽然我已经投降打算follow他们用because（因为我不这么用就被扣分...）,但我十分想知道个究竟,到底为什么必须用because不能用that
ps.不要再跟我说because和that都可以之类的回答了,我明确告诉你：在加拿大,一万个本地人里一万个都用because,不管是在academic writing还是在口语中
别回答无关的东西了
我只wonder两件事
1、为什么because比that更好
2、为什么be动词后可以接连词because

优质解答

参考美国传统词典because词条的特别说明：
Usage Note: A traditional rule holds that the construction "the reason is because" is redundant, and should be avoided in favor of "the reason is that." The usage is well established, however, and can be justified by analogy to constructions such as "His purpose in calling her was so that she would be forewarned of the change in schedule" or "The last time I saw her was when she was leaving for college". All three constructions are somewhat less than graceful, however.
可见,专家们想让人用 is that ,但是 is because 的用法已经摆脱了语法的束缚,成为既成事实了.