Some arguments are fallacious due to imprecise use of language. When a word, phrase, or sentence is used in different senses in course of an argument this type of fallacy is committed.
Some arguments are fallacious because they are based on unwarranted assumptions. In these arguments the error arises out of an implicit supposition of some other proposition whose truth is uncertain or questionable.
Fallacies of immediate inference occur when the rules of different types of immediate inference are violated. One such fallacy is the fallacy of illicit conversion. This fallacy occurs when we make a simple conversion of an A-proposition.