Quintus cibum portat . Quintus carries food. Quintus is the subject who performs the action of the verb portat . From the nominative forms of the adjective, one can always tell the declension to which it belongs. An adjective never changes declension and it is very common to have an adjective of one declension modifying a noun from another declension.
Adverbs are indeclineable and never change form.
Many do, however, possess degree and can become comparative or superlative . The infinitive is the second word in the dictionary listing of a verb. There are four main Latin verb conjugations which can be recognized by the letter before the final - re of the infinitive. These verbs have passive endings, but active translations. An example of a common noun is hostis because an enemy can be either masculine or feminine.