When you make a case for something in writing or speaking, you put together two or more ideas in order to prove your point. Sometimes your ideas do make logical sense. Sometimes they do not. All cats normally have two eyes.
All cats have six paws.
All cats have four paws. Below are some common fallacies used by speakers and writers. Sometimes these fallacies are accidental. With non sequitur the writer or speaker reaches a conclusion that does not follow the premises that come before. The school has unmanageable students.