CLAIRE LECOINTRE: The analysis of nominal verb forms in XVlth and XVllth Sanctius-type latin grammars. Expressions which are difficult to analyze can often be interpreted with the help of sentences which are considered as equivalent, and the structure of which is clear. Certain XVIth and XVIIth century grammarians who support the theories of Sanctius, use such equivalencies as a method of reasoning, basing themselves on the parallelism they postulate between form and function. This allows them to find a grammatical level where the expressions of the nearly always figurative colloquial language are made explicit. This article tries to show the types of reasoning used in Sanctius-type latin grammars, through the analysis of the nominal verb forms they propose.