在英语中，当你被车撞时，你可以说："I was hit by a car."

这句话的来源是英语动词"hit"，意思是"击中、打击、撞击"。

其他常见的表达方式包括：

"I was run over by a car."

这句话的来源是英语动词"run over"，意思是"碾过、被车辙过"。

例句：

"I was hit by a car while I was crossing the street."

意思是：我在过马路时被车撞了。

"I was run over by a car while I was riding my bike."

意思是：我在骑自行车时被车碾过。

这些表达方式均用于描述被汽车撞倒的事故。