estudiar

Estudiar means to study in the broadest sense — to read for a class, to learn a subject, to examine a problem, to consider a proposal. It is a perfectly regular -ar verb, with no stem changes, no spelling changes, and no irregular forms anywhere in the paradigm. If you can conjugate hablar, you can conjugate estudiar. That is most of the good news.

The small bit of orthographic trickery comes from the -iar ending. Spanish -iar verbs split into two camps: those where the i is part of a diphthong with no accent (estudio = es-tu-dio, two syllables for the verb stem) and those where the i carries a written accent and forms its own syllable (envío = en-ví-o). Estudiar belongs firmly to the first camp. The yo form is estudio, not estudío, and every other form follows the same pattern. Compare envío, envías, envía, enviamos, enviáis, envían (enviar, with an accent on every singular and 3pl) against estudio, estudias, estudia, estudiamos, estudiáis, estudian (no accents anywhere). Whether a given -iar verb takes the accent or not is unpredictable from spelling alone — you have to learn each one individually. The major no-accent verbs include estudiar, cambiar, copiar, limpiar, anunciar, odiar, premiar, apreciar, asociar. The major accent verbs include enviar, guiar, confiar, fiar, criar, liar, espiar, vaciar.

Non-finite forms

Indicative — simple tenses

Presente

Note that estudiáis keeps the written accent on the -á- — that accent belongs to the -áis ending, not to the i of the stem. It marks the stressed vowel of the vosotros form in -ar verbs (habláis, cantáis, estudiáis).

Pretérito perfecto simple

The yo and él forms (estudié, estudió) carry the regular -ar preterite accent. The nosotros form estudiamos is identical to the present — context disambiguates.

Pretérito imperfecto

Futuro simple

Condicional

Indicative — compound tenses

Every compound tense pairs haber with the perfectly regular participle estudiado.

Pretérito perfecto compuesto

This is the Spain default for actions completed within an open time frame ("today," "this week," "recently"). For events the speaker frames as concluded ("yesterday," "last year"), the pretérito perfecto simple dominates.

Pretérito pluscuamperfecto

Futuro compuesto

Condicional compuesto

Subjunctive — simple tenses

Presente de subjuntivo

The endings flip from -a- (indicative) to -e- (subjunctive). Note again no accent on the i of the stem — estudie, estudies, estudie are all stressed on the -u-. Only the vosotros form estudiéis takes a written accent, and that accent sits on the -é- of the ending, not on the stem.

Imperfecto de subjuntivo (-ra / -se)

Both -ra and -se sets are interchangeable; the -ra set dominates in everyday Spain. The -se set survives in formal writing and elevated speech.

Subjunctive — compound tenses

Pretérito perfecto de subjuntivo

Pluscuamperfecto de subjuntivo

Imperative

Because estudiar is fully regular, every imperative form follows the -ar default — including the peninsular vosotros affirmative estudiad with its characteristic -ad ending.

When you attach an object pronoun to an affirmative imperative, the stress shifts and may require a written accent: estúdialo, estudiadlo, estúdienlo. The vosotros form drops its final -d before the reflexive -os (rare with estudiar but a general rule: sentaos, not sentados).

Meanings beyond "to study"

Estudiar covers a wider range than English to study. Worth knowing in peninsular Spanish:

The "consider doing something" sense (estudiar + infinitive) is common in news and business registers in Spain: El gobierno estudia subir el IVA (The government is considering raising VAT). Learners often miss this and translate every instance as to study, which produces nonsense.

High-frequency collocations from peninsular Spanish

The classic English-speaker error

English study takes for before an exam (study for the test) and at before an institution (study at Oxford). Spanish estudiar takes para before an exam and en before an institution. The split is clean, and English speakers reliably get it wrong by importing por.

• Estudio para el examen. — I'm studying for the exam. (para, never por.)
• Estudio en la universidad. — I study at the university. (en, never a.)
• Estudio Medicina. — I'm studying Medicine. (No preposition at all — Medicine is the direct object.)

The deeper logic: para marks the goal of the studying (the exam you're aiming at), while en marks the location (the institution where the studying happens). Por would suggest cause or motive, which is not the relationship here.

Common Mistakes

Key Takeaways

• Estudiar is a fully regular -ar verb — no stem changes, no spelling changes, no irregular forms anywhere.
• The yo form is estudio, two syllables (es-tu-dio), with no written accent on the i. Estudío would be a different word and is wrong.
• The peninsular vosotros forms are estudiáis (present), estudiad (affirmative imperative), no estudiéis (negative imperative).
• Three prepositions to keep straight: estudiar Medicina (no preposition, direct object), estudiar *en Salamanca (location), estudiar **para el examen (goal). *Por is wrong with this verb in academic senses.
• The "consider doing something" sense — El gobierno estudia subir impuestos — is common in Spanish news and business registers and does not translate as to study in English.
• Estudiar oposiciones (to prep for civil-service exams) is a uniquely Spanish use that learners encounter constantly.