ما ينصرف و ما لا ينصرف عند النحويين القدامى و المحدثين

الملخص EN

The noun which is conjugated is the one in which vowels appear on it.

This because it is unlike verb, but the noun which is not conjugated is the one which fragment does not appear on it because it is like the verb.

The noun which is not conjugated must have one adjective which is a branch of adjectival; male is a branch of female and plural is a branch of singular….etc.

There are five types of verbs that are not conjugated with unknown and known, while the seven conjugated verbs according their literal case all of them are mentioned in details in the study.