Conjugation Rules
- Identify the infinitive form of the verb (i.e. the dictionary version of the word). It always ends in -ar, -er, or -ir.
- Remove the infinitive ending (-ar, -er, or -ir) to find the stem of the verb.
- Add the appropriate endings based on the subject pronoun.
Simple Present Tense
| Verb Type | -AR | -ER | -IR |
|---|
| Yo | -o | -o | -o |
| Tú | -as | -es | -es |
| Él/Ella/Ud | -a | -e | -e |
| Nosotros | -amos | -emos | -imos |
| Vosotros | -áis | -éis | -ís |
| Ellos/Ellas/Uds | -an | -en | -en |
Preterit Tense (Past)
| Verb Type | -AR | -ER | -IR |
|---|
| Yo | -é | -í | -í |
| Tú | -aste | -iste | -iste |
| Él/Ella/Ud | -ó | -ió | -ió |
| Nosotros | -amos | -imos | -imos |
| Vosotros | -asteis | -isteis | -isteis |
| Ellos/Ellas/Uds | -aron | -ieron | -ieron |
Imperfect Tense (Past)
| Verb Type | -AR | -ER | -IR |
|---|
| Yo | -aba | -ía | -ía |
| Tú | -abas | -ías | -ías |
| Él/Ella/Ud | -aba | -ían | -ían |
| Nosotros | -ábamos | -íamos | -íamos |
| Vosotros | -abais | -íais | -íais |
| Ellos/Ellas/Uds | -aron | -íeron | -íeron |