I must get up early to catch the first train.这句话的结构是什么呀 为什么t

I must get up early to catch the first train.这句话的结构是什么呀 为什么t I had to get up early so that I could catch the first bus. I had to get up early so that I could catch the first bus.改为 You must get up early not to miss the train I got up early to catch the train the first we must get up early,or we will miss the train 改错 I get up very late.I can't catch the early bus I get up ____ you have to get up early to catch the fist bus的否定句是什么? i wanttd to catch ____ early train,but couldn't get ___ ride 2.I wanted to catch ____ early train,but couldn’t get ____ r ____(catch) the first bus ,she had to get up early I get up early in order to catch the early(同义句)