If there is a certain formalized reasoning or argument, natural language can only know for sure if it is reasoned correctly , or whether it is valid, by simply examining the truth value of premises and its conclusion if the last is false and the premises first.
But if this is not the case, what can be done is find another argument or reasoning with the same logical form, but has true premises and false conclusion .
If it is demonstrated that the first argument is not correct, so that as proof that logic is invalid.
However, if there is no such argument true premises and false conclusion and the same structure or form not shown that the reasoning is correct , its form is valid.
In sum, examining truth values \u200b\u200bof premises and conclusion can know with certainty that a logical form is invalid , but not if it is valid, the only finding of an informal argument with true premises and false conclusion.
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