Use the present for current actions, habitual routines, general truths, and with expressions like "hace + time" to describe how long something has been going on.

Signal words: ahorahoysiempretodos los díasnormalmentehace + timeen general
Pronoun Present
yo pronuncio
pronuncias
él/ella/Ud. pronuncia
nosotros pronunciamos
vosotros pronunciáis
ellos/ellas/Uds. pronuncian

Use the preterite for actions completed at a specific point in the past — things that started and finished, happened a specific number of times, or occurred in a defined time period.

Signal words: ayeranteayerel lunesla semana pasadauna vezen 2020hace + time + que
Pronoun Preterite
yo pronuncié
pronunciaste
él/ella/Ud. pronunció
nosotros pronunciamos
vosotros pronunciasteis
ellos/ellas/Uds. pronunciaron
Key contrast

"Hablo español" (present — I speak Spanish, habitually) vs "Hablé con él ayer" (preterite — I spoke with him yesterday, completed). The time expression usually makes the choice obvious.

Present vs Preterite: common questions

When should I use the present vs the preterite in Spanish?

Use the present for current or habitual situations, and the preterite for completed past actions. If you can ask "when did it end?" and give a specific answer, use preterite.

How does "hace" work with the present and preterite?

With the present: "Hace dos años que estudio español" = I have been studying Spanish for two years (still ongoing). With the preterite: "Hace dos años estudié en Madrid" = Two years ago I studied in Madrid (completed).

Are there verbs that are almost always in the present tense?

Some verbs like ser, estar, tener, and querer appear very frequently in the present because they describe states rather than discrete events. But all can appear in the preterite when describing a completed state.

Practise both tenses with pronunciar using spaced repetition.