He usually gets up at 6 o'clock in the morning ,but he had to get up very early yesterday morning..

问题描述:

He usually gets up at 6 o'clock in the morning ,but he had to get up very early yesterday morning..
He usually gets up at 6 o'clock in the morning ,but he had to get up very early yesterday morning because he wanted to catch a train.
这里的get为什么不用过去式got?
catch为什么不用过去式?
because he wanted to catch a train.
这里的catch为什么不用过去式?

第一个是have to 后接动原 固定搭配
第二个是动词不定式后接动原
不知道对不对- - 英语忘记蛮多了