i'm sorry i took your umbrella / mistake.a；by; why?

i'm sorry i took your umbrella / mistake.a；by; why?

by
take sth by mistake 错拿了.东西

by mistake 错误地。懂？

by
by mistake错误地；无意中

你要问什么？

by mistake“错误地”
Excuse my taking your umbrella bymistake.
请原谅我错拿了你的伞。

i'm sorry i took your umbrella （by） mistake。
句子意思是：很抱歉我错拿了你的雨伞。
BY MISTAKE 是固定用法

by mistake 错误地...