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A terminological note: nouns, adjectives and pronouns have declensions; verbs have conjugations.

If you have the infinitive (second principal part) and length markings on your vowels, the task is easy:

1st conjugation: infinitive ends in -āre(passive/deponent -ārī)

2nd conjugation: infinitive ends in -ēre(passive/deponent -ērī)

3rd conjugation: infinitive ends in -ere(passive/deponent -Ä«)

4th conjugation: infinitive ends in -īre(passive/deponent -īrī)

If you have the infinitive but no length markings, you can tell the 2nd and 3rd conjugations apart by looking at the first-person singular indicative (the first principal part). If this ends in -eo, it's a 2nd-declension verb; if it ends in -io, (e.g., capio) or just -o (e.g., cano) it's 3rd.

If you don't have the infinitive, knowing one or more forms from the present indicative can help:

1st conjugation: first person singular ends in -ō, third singular in -at

2nd conjugation: first person singular ends in -eō, third singular in -et

3rd conjugation: first person singular ends in -ō or -iō, third singular in -it

4th conjugation: first person singular ends in -iō, third singular in -it

In the absence of the infinitive, -iō verbs of the 3rd conjugation can be hard to tell from 4th-conjugation verbs. Having vowel markings can help; for example, 4th-declension venīmus"we come" (long ī, accent on the second syllable) versus 3rd-declension capimus "we take" (short i, accent on the first syllable). The imperatives also differ: 4th-declension venī "come!" versus 3rd-declension cape "take!"

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Q: How can you tell what declension a latin verb is?
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