sumimasen / 
            suimasen
           
           | 
          I'm sorry. (Excuse me.)  
    - Can be used to get someone's attention.  | 
        
        
          gomen nasai / 
      gomen 
            | 
          Forgive me. (The nasai form is polite.)  
    - Use for apologies or when declining something.  | 
        
        
          | shitsurei shimasu  | 
          Please excuse me. (Lit. I'm going to break form.)  
    - Use when entering a room during a meeting (for serving tea etc.) or when looking for something on someone's desk. (If you are intruding on someone's time/space it's good to say this.)  
    - Used by school children as they enter the teachers' room.  | 
        
        
          | shitsurei shimashita  | 
          Please excuse me, I was rude. (Lit. I broke form.) 
      - Use when exiting a room. 
      - Used by school children as they exit the teachers' room.   | 
        
        
          moushiwake gozaimasen /  
    moushiwake arimasen | 
          I have no excuse. (The gozaimasen form is more polite.) | 
        
        
          | ikenai koto o shimashita  | 
          I've done something I shouldn't have.  | 
        
        
          | watakushi ga warukatta | 
          I was wrong. (Lit. I was bad.)  |