I was aiming at the tree but hit the car by mistake.(我對準樹射擊，不料誤中了汽車。)

Someone took my hat by mistake.(有人錯拿了我的帽子。)

I took his umbrella by mistake.(我錯拿了他的雨傘。)

She put salt into her coffee by mistake.(她誤把鹽放到咖啡里去了。)

He took my pen by mistake.(他錯拿了我的鋼筆。)

Maybe he took yours by mistake.(也許他錯拿了你的。)

She greeted the man by mistake.(她錯跟那個人打了招呼。)

I did it by mistake.(我誤做了這事。)

I brought other baggage by mistake.(我拿錯了別人的行李。)

So sorry, I took your school T-shirt by mistake.(很抱歉，我誤拿了你的校服。)