In this work, we study the transformational relations between adjectival and verbal constructions in a syntactic approach. This study is composed of three parts. First, we describe the characteristics of this type of adjectives and we deal with different problems such as the collection of these adjectives, the description of their syntactic properties, etc. The second part includes the chapters 3 and 4, in which we describe the similarities and the differences between the two constructions. Syntactic and transformational regularities appear but they are not systematic, thus the construction of the lexicon-grammar of these adjectives is necessary. In the third part, which contains chapters 5 and 6, we describe adjectival constructions that have an appropriate noun in subject position. First, we classify these nouns according to semantic criteria, then we investigate the properties of the constructions obtained with different transformations, i.e., a nominal sentence containing a support verb, a sentence in which the subject is restructurated and a metonymical sentence.