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==Importance of argument form==
Attention is given to argument and sentence form, because ''form is what makes an argument [[Validity (logic)|valid]] or [[cogency|cogent]]''. All logical form arguments are either inductive or deductive. Inductive logical forms include inductive generalization, statistical arguments, causal argument, and arguments from analogy. Common deductive argument forms are [[hypothetical syllogism]], [[categorical syllogism]], argument by definition, argument based on mathematics, argument from definition. The most reliable forms of logic are [[modus ponens]], [[modus tollens]], and chain arguments because if the premises of the argument are true, then the conclusion necessarily follows.<ref>{{cite book | author1=Bassham, Gregory | title=Critical thinking : a student's introduction | publication-date=2012 | publisher=McGraw-Hill | edition=5th | isbn=978-0-07-803831-0 }}</ref> Two invalid argument forms are [[affirming the consequent]] and [[denying the antecedent]].
;Affirming the consequent
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