That's why和That's because区别 that's why i was late for the appointment.that's why 做什么成分?

That's why和That's because区别 that's why i was late for the appointment.that's why 做什么成分?
That's why和That's because区别 that's why i was late for the appointment.that's why 做什么成分?

That's why和That's because区别 that's why i was late for the appointment.that's why 做什么成分?
That's why...那就是我为什么.的理由/原因That's why I was late for the appointment.那就是我为什么约会迟到的原因.
That's because...那是因为.
这里的why-从句用作表语,是表语从句.

我也不懂哎。