Question

Telling: I was really mad 
showing

Answers

GPT-4o mini
Instead of simply telling that you were really mad, you could show it through actions and descriptions. Here's an example:

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As I stormed into the room, my fists were clenched so tightly that my knuckles turned white. My heart pounded in my chest, and I could feel heat rising to my face. I threw my bag onto the floor with a loud thud, causing everyone to look up in surprise. My jaw was set tight, and I could barely manage to keep my voice steady as I glared at the wall, envisioning a thousand things I wished I could say. The silence felt heavy, punctuated only by my sharp breaths, as I paced back and forth, the tension crackling in the air around me.

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This way, the reader can infer your anger through your physical reactions and the atmosphere instead of being told directly.