我骑自行车摔倒了用英语怎么说

"I fell off my bike" 是表达骑自行车摔倒的常用英语表达。

来源：fall off 是个短语，意思是从某物上掉下来。在这种情况下，指从自行车上掉下来。

例句：

I fell off my bike and scraped my knee. (我从自行车上摔下来，擦伤了我的膝盖。)
He fell off his bike and broke his arm. (他从自行车上摔下来，断了手臂。)
She fell off her bike and got a concussion. (她从自行车上摔下来，震脑了。)