One sunny day, Peppa Pig was playing with her friends in the muddy puddle. She was jumping around and splashing mud everywhere. But, something was bothering her. It was her friend, Niva the cat, who was always sticking her tongue out at Peppa.

"Niva, why do you always stick your tongue out at me?" asked Peppa, trying to understand her friend's behavior. Niva just giggled and stuck her tongue out even more.

Feeling annoyed, Peppa ran to her mother, Mummy Pig, and told her what Niva was doing. Mummy Pig listened carefully and then decided to teach Peppa an important lesson about language.

"Peppa, do you know why we have tongues?" Mummy Pig began. "We have tongues to taste, to help us speak, and to express our feelings. But sometimes, people or animals may use it differently."

"Like Niva?" Peppa asked. Mummy Pig nodded and continued, "Yes, like Niva. She might be doing it because she thinks it's fun, or maybe she doesn't know that it's not nice."

"So, what can I do about it?" Peppa asked. Mummy Pig smiled and said, "You should tell Niva how you feel. Use kind words and explain that her behavior makes you uncomfortable."

The next day, Peppa approached Niva and said, "Niva, I don't like it when you stick your tongue out at me. It makes me feel bad. Can you please stop doing it?" Niva looked surprised.

"I didn't know you felt that way, Peppa. I'm sorry. I was just doing it for fun. I won't do it anymore," Niva promised. Peppa smiled and thanked her friend for understanding.

"I'm proud of you, Peppa," said Mummy Pig, when she heard the news. "You've learned an important lesson today. Using kind words can resolve many problems."

From that day on, Peppa and Niva played happily in the muddy puddle, without any tongue-sticking. And Peppa learned the importance of expressing her feelings using kind words.