that's
that\'s why和that\'s because的区别是用法、意思的不同。that\'s why +句子(句意为这件事的结果),that\'s because+句子(句意为这件事的原因)。
例句That is why...与“That is the reason why...”同义,只不过从语法结构上讲, “That is the reason why...”中why引导的`是—个定语从句, 将其中的the reason去掉则与“That is why...”结构一样。That is because...”句型中从属连词because引导的名词性从句在此作表语, 这也是个常用句型, 意为“这就是为什么……/因为……”。