1. The infinitive: This is the most common meaning of "nominal form" in French. It's the base form of the verb, ending in "-er", "-ir", or "-re". For example:
* Parler (to speak)
* Finir (to finish)
* Vivre (to live)
2. The gerund: This form ends in "-ant" and describes an action in progress. It can function as a noun or an adjective. For example:
* Parlant (speaking)
* Finissant (finishing)
* Vivant (living)
3. The past participle: This form usually ends in "-é", "-i", or "-u" and describes a completed action. It can function as an adjective, a noun, or part of a compound verb. For example:
* Parlé (spoken)
* Fini (finished)
* Vecu (lived)
4. The present participle: This form ends in "-ant" and describes an action in progress, but unlike the gerund, it's used only as an adjective. For example:
* Une personne parlant anglais (a person speaking English)
* Un travail finissant (a finishing job)
To be more precise, please provide the specific context where you encountered the term "nominal form" in French. This will help me understand what you're asking and provide a more accurate answer.