Learn when you can you say "I'm sorry", "I apologize" and "my apologies". Expressing regret and remorse is essential in your basic English vocabulary. There are multiple ways you can express regret and remorse in English. The three most common are: I'm sorry (to be sorry). I apologize (to apologize). My apologies (noun). First, you'll learn the meaning of "I'm sorry", "I apologize" and "my apologies". Next, you'll learn the correct sentence structure so you can form grammatically correct sentenc