A preposition shows a relationship between its object and another word, usually a verb. Quintus ad portas urbis ambulat. Regular verbs have four principal parts. Latin prounouns, like nouns, have case , number and gender . Most verbs express action.
Verbs are either active or passive voice.
Active voice verbs have a subject which performs the action the verb expresses and may take a direct object. Passive verbs have a subject which is acted upon and can never take a direct object.