The noun 'France' does not change as a subject noun. Any noun functions as the subject of a sentence or a clause, and as the object of a verb or a preposition without changing form.
Examples:
It depends on the subject of the sentence.He/she/it and singular noun subject use has been.He has been to France. The doctor has been to France.You/we/they and plural noun subject use have been.We have been to France. The Doctors have been to France.
To change "France" from a proper adjective to a proper noun, you can refer to France as a specific place, country, or entity instead of using it to describe something. For example, instead of saying "French culture," you can say "France's culture," making "France" the proper noun.
That would be the subject of the sentence.
It would more commonly be an object noun.
No, the noun France is a proper noun, the name of a specific place; the common noun is country.
Noun forms for splendid are splendidness or splendor.
The abstract noun form of the adjective 'innocent' is innocence.
The noun form of the adjective enthusiastic is enthusiasm.
The noun form for the adjective desperate is desperateness.A related noun form is desperation.
No, the noun France is a proper noun, the name of a specific place; the common noun is country.
The common noun for the proper noun France is country.Other common nouns for France, officially République Française, are place, republic, homeland, etc.
The noun 'France' is a singular, concrete, proper noun; the name of a specific country; a word for a place.A proper noun is always capitalized.