Be careful with fire. It can burn you. - Fire has things it is useful for, but if it gets out of control bad things can happen that are undesirable. Pay attention to there, they're, and their. They all sound the same but have different meanings. - Using the wrong spelling can make a paper look unprofessional, so taking the time to use the correct spelling can be beneficial. Beware of sharks. - Sharks are something we cannot control. They may lunge at us and bite us. You want to know where they are at and what they are doing so you do not get injured.