I felt like a fool when I walked into the wrong classroom.
我走錯教室的時候，覺得自己像個傻瓜。
Don't be a fool. Bring an umbrella!
別傻了，帶把傘吧！
He made a fool of himself at the school talent show.
他在學校才藝表演上出糗了。
My friends played a joke on me on April Fools' Day.
朋友在愚人節捉弄我。