看懂美剧你要知道这些口语

它相当于'why'.这种用法在口语中特别常用.

A：How come you're so late? 你怎么来得这么迟？
B：You know, the buses are usually very full at this time of the day. I'm waiting for quite a long time.通常每天这个时候公交车都很挤，我等了很久才坐上。