How can you tell what declension a latin verb is?

You can't tell the declension of a Latin *verb*. Declension refers to the patterns of inflection for *nouns, pronouns, and adjectives*. Verbs are conjugated, not declined. They follow conjugation patterns, not declension patterns.

There are four main conjugations of Latin verbs, identified by the infinitive ending:

* First Conjugation: -āre (e.g., amāre - to love)

* Second Conjugation: -ēre (e.g., monēre - to warn)

* Third Conjugation: -ere (e.g., dūcere - to lead) *Note: This is a large conjugation with sub-groups based on vowel changes.*

* Fourth Conjugation: -īre (e.g., audīre - to hear)

There are also irregular verbs (like *sum*, "to be") that don't fit neatly into these conjugations. Identifying the conjugation involves looking at the infinitive form and then observing the characteristic vowel changes in the present tense and other tenses.