How Do You Know if You Plagiarise?

If I think I may have plagiarized, step one is just to talk to brothers and ask them to listen to it, talk to my wife. Try to get clearly in mind yourself. Try to understand exactly what you did that was wrong. Use it as an opportunity to investigate your own motives. What led you to feel you needed to use those words instead of your own words? How did you, what was behind you getting in that state? That's how he gets to some of the other more structural questions, at least in some cases, are probably why plagiarism is happening.