stop的过去式和过去分词是什么

　　例句：

　　We had to stop every few miles.

　　我们每走几英里就得停一停。

　　She brought the car to a stop.

　　她停住汽车。

　　He was headed for the bus stop.

　　他朝公交车站走去。

　　They bellowed at her to stop.

　　他们吼叫着让她停下。

　　We stop growing at maturity.

　　我们在成熟后就停止成长了。