Write a joke in English and translate it

One day after school the teacher said to his students, "

Tomorrow morning, if any one of you can answer my first

question, I will permit him or her to go home earlier." The

next day, when the teacher came into the classroom, he

found the blackboard daubed. He was ver y angry and

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asked, "Who did it? Please stand up!" "It's me," said Bob,

"Now, I can go home. Good-bye, Sir."

One day, after school, the teacher said to his students: "Tomorrow morning, if

any of you students can answer my question first, I will

Allow him or her to go home first. "The next day, when the teacher walked into the classroom, he found that the blackboard was messy. He asked very angrily: "Who painted it?

Come on!" Bob said, "Sir, it's me. I can go home now. Goodbye!"