场景：一间普通的教室，墙上挂着地图和一些装饰画。课桌整齐排列，讲台后有一块黑板。主角是两个学生——小明和小华，以及他们的英语老师Mr. Brown。

（上课铃响，Mr. Brown走进教室）

Mr. Brown: Good morning, class! Today we will learn about the past tense. Everyone, please open your books to page 56.

小明: （低声对小华）Hey, Xiao Hua, what’s a past tense? Is it something like yesterday's lunch?

小华: （捂嘴偷笑）I don’t know. Maybe it’s something you eat before breakfast.

Mr. Brown: （听到他们的窃窃私语）What was that? Did someone say something about food?

小明: No, sir! We were just... um... practicing our English skills.

小华: Yeah, we were talking about how delicious past tense is.

Mr. Brown: （皱眉）Past tense is not food! It’s a verb form used to describe actions that happened in the past. For example, "I ate an apple."

小明: Oh, I get it now! So “ate” is the past tense of “eat”?

小华: （举手）Teacher, can I try? How do you say “I go to school” in the past tense?

Mr. Brown: Excellent question! The answer is...

小明: （抢答）"I went to school!" Right?

小华: （点头）Right! Just like when you went to bed last night.

Mr. Brown: （无奈地摇头）Yes, very good. Now let’s practice some more examples.

（Mr. Brown writes on the board: "I walk → I walked")

小明: Wait, wait! Does this mean if I write "I walk", it means I’m walking right now?

小华: （笑）And if you write "I walked", does it mean you’re walking backward?

Mr. Brown: （忍不住笑了）No, no, no! Writing "I walked" simply means you did the action in the past.

小明: （认真地点点头）Got it! So if I write "I eat pizza", it means I’m eating pizza right now, but if I write "I ate pizza", it means...

小华: （打断）It means you’re full now!

（全班哄堂大笑）

Mr. Brown: （笑着擦掉黑板）Alright, alright, enough jokes. Let’s move on to another example.

（下课铃响，学生们开始收拾书包）

小明: （突然想起什么）Oh, Mr. Brown, one last question. What’s the past tense of “laugh”?

小华: （立刻接话）Is it "laughed"?

小明: （得意地点头）Exactly! And guess what happens when you laugh in the past?

小华: （兴奋地拍手）You cry in the present!

（两人哈哈大笑，跑出教室）

Mr. Brown: （站在门口看着他们离去的身影）These kids... they’ll never grow up.

（剧终）

希望你喜欢这个搞笑的小故事！