Cách sử dụng
The expression "you could have fooled me" is a response to something that someone has said or done that you don't believe or don't agree with. It means that the person's words or actions don't seem truthful or convincing to you. For example, if someone says they are an expert in a certain topic, but they say something that you know is incorrect, you could say "you could have fooled me" to express your disbelief. Essentially, it's a way of saying that you aren't convinced by what someone has told you.