scrape的过去式怎么变化

例句：

I scraped the side of my car on the wall.

我车的'一侧被墙刮了。

How did you get that scrape on your knee?

你膝盖上的擦伤是怎么弄的？

She fell and scraped her knee.

她摔了一跤，把膝盖蹭破了。