Change to humble: 「私が明日、電話します。」 A2: 「私が明日、お電話いたします。」
Drills (Levels A, B, and C) allow the learner to "rehearse" the story themselves, moving from basic patterns to actual situational usage. You can find the full Shin Nihongo no Keigo Training PDF on Scribd to follow this journey for yourself. specific scenario , such as how to handle a formal business apology? 新・にほんご敬語トレーニング| PDF - Scribd shin nihongo keigo training pdf