Social
Congratulating someone
Congratulate a friend or colleague on a promotion, milestone, or personal achievement.
What makes this one hard
Generic congratulations are safe and forgettable; the difference is naming the specific thing the person did. English also runs warmer here than Korean instinct suggests, so calibrated enthusiasm is part of what gets practiced.
Practice every scenario with a real AI partner
Free to start. The partner reacts in voice, stays in role, and gives feedback on what you said and what you could have said better.