Here are some common phrases to express blaming and accusing in English. Expressions of Blaming Someone: It’s your fault. It’s your mistake. I can’t believe that you did it. How could you do such a thing? Are you out of your mind? What on earth were you thinking? I think you are the one to blame. I think you are the one who could have done it. Expressions of Accusing Someone: It must have been you who did it. I think you’re the only person who could have done it. You must be doing something wrong. Accepting blaming and accusing: I’m sorry. It’s my fault. I’m sorry for the things I’ve done. I’m really sorry. I didn’t mean to. Sorry for my fault. It’s my responsibility. I’m sorry. You’re right! It’s my fault. I’m sorry. Refusing blaming and accusing: It’s not true. It’s not my fault. I’m not the one to blame. I didn’t do it. You’re wrong. It wasn’t me.