Teacher asks students general "Have you ever...?" questions to introduce the structure. Example questions: Have you ever treated a cat with a broken leg? Have you ever given a dog an injection? Have you ever performed surgery? Next, T activates vocabulary matching common veterinary actions with past participles: Example pairs: "I have treated a dog with an eye infection." (treat) "The vet has diagnosed a skin disease." (diagnose) "We have just vaccinated a puppy." (vaccinate) Challenge: Ask students to add "just," "already," or "yet" to their sentences.

Now the stage is set for Ss to begin their simulation: On the board, T writes: "What Has Happened at the Clinic?" Activity: In pairs, students brainstorm recent events in a veterinary clinic using the present perfect. Students suggest actions (e.g., "A cat has arrived with a broken leg.") Another S expands: "Has anyone examined it yet?", etc.

Reflection & Debrief (10 min) – "Vet Case Report" Task: Students write a short report summarizing what they have done in the scenario. Example report: "A client has brought in a dog with diarrhea." "We have examined the dog and taken X-rays." "The vet has prescribed antibiotics." Pair Share: Students read their reports to a partner and discuss alternative treatments. T highlights main structural and pronunciation points & Ss pose final questions/doubts, helping each other when possible.