They get up very early so that they can catch the first bus.
或者 They get up very early in order to catch the first bus.
或者 They get up so early that they can catch the first bus.
都可以,你学过哪个词组,就用哪个
They got up very early to catch the first bus.
是第一趟班车还是早班车?早班车是:the early bus
he get up early for the first,car 我觉得要是没有特别需要美国人反而很少说词组哦