scrape的過去式怎么變化

　　例句：

　　I scraped the side of my car on the wall.

　　我車的一側(cè)被墻刮了。

　　How did you get that scrape on your knee?

　　你膝蓋上的擦傷是怎么弄的？

　　She fell and scraped her knee.

　　她摔了一跤，把膝蓋蹭破了。