1 The reason why...is that...
翻译：...为什么...的原因是...
如：The reason why he was late for school was that he got up late.
他上学迟到的原因是他起床晚了。
2 That's why...
翻译：那就是...为什么...的原因。
如：He got up late. That's why he was late for school.
他起床晚了。那就是他为什么上学迟到的原因。
3 it is because...
翻译：它是因为...。
如：He was late for school. It was because he got up late.
他上学了。它是因为他起床晚了。
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