why和because是两个常用的英语单词，一个是表示“为什么”，一个是表示“因为”。这两个单词都可以用来引导原因性状语从句，即that's why和that's because，那么，两者之间有什么区别呢?
一、that's why 和that's because区别
1.“that's why”通常用来表达某件事情或某种情况的结果或结论，即为什么会出现这种情况或结果。它通常出现在一个结论或结果的上下文中，用来解释或说明前面所述的情况或事实的原因。例如：
Why did you decide to quit your job?你为什么决定辞职?
Because I was tired of working long hours. That's why I decided to look for a new job.
因为我不想再长时间工作了。这就是我为什么要找一份新工作。
2.“that's because”则用来确认前面所叙述的情况或事实的原因，即为什么会这样。它通常出现在一个询问原因的上下文中，用来解释或说明前面所叙述的情况或事实的原因。例如：
Why is the sky blue?什么天空是蓝色的?什么天空是蓝色的?
That's because the sun rays are being scattered by the atmosphere.
因为太阳光线被大气层散射了。
因此，“that's why”强调的是结果或结论，而“that's because”强调的是原因或起因。在具体使用时，需要根据上下文和语境来选择使用哪个表达方式。
二、that's why 和that's because例题
1.______ the teacher was late for class.
A. That's why B. That's how C. That's when D. That's what
2.______ my parents didn't agree with my decision.
A. That's what B. That's where C. That's how D. That's why
3.______ I didn't go to the party.
A. That's when B. That's where C. That's how D. That's because
4.______ she didn't finish her homework.
A. That's what B. That's where C. That's how D. That's why
5.______ he was late for school.
A. That's what B. That's where C. That's how D. That's why
答案解析：
1.答案：A. That's why
解释：根据句意，“这就是为什么老师上课迟到的原因”，因此答案为A，“That's why”。
2.答案：D. That's why
解释：根据句意，“这就是为什么我的父母不同意我的决定”，因此答案为D，“That's why”。
3.答案：D. That's because
解释：根据句意，“我没去参加聚会，因为我很累”，因此答案为D，“That's because”。
4.答案：D. That's why
解释：根据句意，“这就是为什么她没有完成作业”，因此答案为D，“That's why”。
5.答案：D. That's why
解释：根据句意，“这就是他为什么上学迟到的原因”，因此答案为D，“That's why”。
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