Pensar vs Creer vs Opinar: Which Spanish Verb Do You Really Need?

You want to say 'I think it is going to rain,' 'I believe she is right,' and 'What do you think about the proposal?' — and in English, one verb covers all three: think. In Spanish, each of those sentences calls for a different verb.

Pensar, creer, and opinar all translate into English as 'to think,' yet they point in different directions. Pensar is about the act of thinking, planning, and intention. Creer is about believing — taking something to be true. Opinar is about giving an opinion, expressing a view, or holding a position — it lives at the formal end of the register scale. Getting these wrong rarely produces a grammar error, but it consistently produces a meaning error, and meaning errors are harder to detect and correct than conjugation mistakes.

This guide covers pensar in its three main constructions (pensar que, pensar + infinitive, pensar en), creer in its two constructions (creer que, creer en), and opinar — including the register difference that makes opinar the default in interviews and discussions but odd in everyday conversation. Both /spanish-verbs/pensar-conjugation/ and /spanish-verbs/creer-conjugation/ have the full conjugation tables for these irregular stems.

Pensar: thinking as a mental act and as intention

Pensar is the broadest of the three verbs. It covers the act of thinking — forming thoughts, reflecting, considering — and in its most important construction with an infinitive, it expresses intention or plan. The stem changes in the present tense (pienso, piensas, piensa... pensamos, pensáis, piensan), making it an e→ie stem-changer. The preterite is regular: pensé, pensaste, pensó, pensamos, pensasteis, pensaron.

Pensar que — to think that (opinion and reflection)

Pensar que + indicative is how you express what you think is true or what your opinion is on something. The key nuance over creer que is reflectiveness: pensar que implies you have been turning the question over in your mind. Creer que is more about immediate conviction. In practice, the two are often interchangeable in affirmative sentences, but pensar que is preferred when you want to show you have considered the question carefully. After negation, both pensar que and creer que consistently take the subjunctive: No pienso que tenga razón (I don't think he is right). A dedicated guide to this indicative-to-subjunctive flip is at /blog/creer-pensar-indicative-subjunctive-spanish/.

• Pienso que el castellano es más fácil que el alemán. = I think Spanish is easier than German.
• ¿Qué piensas de este proyecto? = What do you think of this project?
• Pensamos que es la mejor opción. = We think it is the best option.
• No pienso que sea una buena idea. = I don't think it is a good idea. (subjunctive after negation)
• ¿Tú qué piensas? = What do you think? (inviting someone's view)
• Pensaba que venías a las seis. = I thought you were coming at six. (expressing a past assumption)

Pensar + infinitive — to plan to, to intend to

This is the construction that creer cannot replicate. Pensar + infinitive (no que, no en — just pensar directly followed by an infinitive) expresses intention or plan, equivalent to 'to plan to do something' or 'to intend to do something.' ¿Qué piensas hacer esta tarde? (What are you planning to do this afternoon?). Pienso quedarme en casa (I plan to stay home). This use of pensar is extremely common in everyday conversation — probably the most common use of the verb outside academic writing — and it has no equivalent in creer or opinar. Never use 'creo ir' where the intended meaning is intention; the correct form is 'pienso ir.'

• ¿Qué piensas hacer este verano? = What are you planning to do this summer?
• Pienso estudiar dos horas esta tarde. = I plan to study for two hours this afternoon.
• ¿Piensas venir a la fiesta? = Are you planning to come to the party?
• Pensamos ir a Sevilla el fin de semana. = We are planning to go to Seville at the weekend.
• No pienso quedarme callado. = I do not intend to stay quiet.
• ¿Y tú qué piensas hacer? = And what do you plan to do?

Pensar en — to think about (someone or something)

Pensar en means to think about someone or something — to have it in your mind, to be reflecting on it. It describes a mental focus rather than an opinion or belief. ¿En qué piensas? (What are you thinking about?) is different from ¿Qué piensas de eso? (What do you think about that?). The first asks what currently occupies your mind; the second asks your opinion or judgement. Pensar en is also used to describe future consideration: lo voy a pensar (I will think about it). Note that with people as the object, pensar en is the most natural phrase — pienso en ti (I am thinking of you) — and it has nothing to do with belief or opinion.

• ¿En qué piensas? = What are you thinking about?
• Estoy pensando en cambiar de trabajo. = I am thinking about changing jobs.
• Pienso mucho en mi familia cuando viajo. = I think a lot about my family when I travel.
• Hay que pensar en las consecuencias. = You have to think about the consequences.
• ¿Has pensado en lo que quieres hacer? = Have you thought about what you want to do?
• Lo pienso y te digo. = I will think about it and let you know.

Creer: believing that something is true

Creer centres on belief — on holding something to be true, on confidence in a fact or person. It is more about certainty than about reflection. When you use creer, you are saying: I hold this to be real or true. Creer is also the verb used for religious belief and personal trust. Conjugation is regular in the present tense (creo, crees, cree, creemos, creéis, creen) but has a spelling change in the preterite third persons (creyó, creyeron) and in the present participle (creyendo) — a pattern shared by leer and oír.

Creer que — to believe that (expressing conviction)

Creer que + indicative is the standard way to express that you believe something is true. The nuance over pensar que is conviction: creer implies more confidence in the factual status of what follows. Creo que tiene razón (I believe he is right) sounds more certain than pienso que tiene razón (I think he is right — personal, reflective opinion). Both are correct in everyday speech, but the choice signals a slightly different level of certainty. When negated, creer que, like pensar que, consistently takes the subjunctive: No creo que tenga razón (I don't believe he is right).

• Creo que llevas razón. = I believe you are right.
• ¿Tú crees que es verdad? = Do you believe it is true?
• No creo que pueda venir. = I don't believe she can come. (subjunctive)
• Creo que va a llover. = I think it is going to rain. (confident prediction)
• Creemos que la solución es otra. = We believe the solution is a different one.
• No creo que sea tan difícil como parece. = I don't think it is as difficult as it seems.

Creer en — to believe in

Creer en means to believe in something — to have faith in it, to trust in its existence or value. Creer en Dios (to believe in God). Creo en ti (I believe in you). Creer en el trabajo en equipo (to believe in teamwork). This construction belongs exclusively to creer: pensar en has a completely different meaning (to think about, to have something in mind), and opinar does not accept this construction at all. Creer en carries a sense of deep trust or faith that goes beyond opinion into something more fundamental — a belief in the worth or reality of something.

• ¿Crees en los fantasmas? = Do you believe in ghosts?
• Creo en el poder de la educación. = I believe in the power of education.
• Creo en ti — sé que puedes hacerlo. = I believe in you — I know you can do it.
• No creen en las dietas milagro. = They do not believe in miracle diets.
• Hay que creer en uno mismo. = You have to believe in yourself.
• Creen en un futuro mejor para todos. = They believe in a better future for everyone.

Opinar: expressing a view (formal register)

Opinar means to have an opinion, to express a view, or to hold a position on something. It is regular and fully correct Spanish, but it sits in a more formal register than pensar or creer. You will hear opinar in interviews, debates, academic discussions, and surveys: ¿Qué opinas sobre la nueva ley? (What is your opinion on the new law?). In casual conversation — with friends in a café, deciding where to eat — opinar can sound slightly stiff or overly deliberate. ¿Qué piensas? or ¿Tú qué crees? are more natural in informal settings.

Opinar can be followed by que + indicative: opino que es un error (in my opinion it is a mistake). It can also stand alone as a prompt: ¿Qué opinas? (What is your opinion?). Unlike pensar, it does not take a bare infinitive to express intention. Unlike creer, it does not collocate with en for religious or personal faith. Opinar is a one-lane verb: it places you on record as holding and stating a view, which is why it feels more formal — you are not just thinking something privately, you are declaring a position.

• ¿Qué opinas sobre la situación actual? = What is your opinion on the current situation?
• Opino que deberíamos esperar antes de decidir. = In my opinion, we should wait before deciding.
• ¿Qué opinan los expertos? = What do the experts think?
• Cada uno puede opinar libremente. = Everyone can express their view freely.
• No sé qué opinar. = I do not know what to think / I do not have an opinion.
• Ella opinó que el cambio era necesario. = She expressed the opinion that the change was necessary.
• ¿Puedo opinar? = May I give my opinion?

Quick-reference: which verb to reach for

When all three work — and when only one does

In many sentences expressing an opinion with que + indicative, all three verbs work. The meaning is similar enough that native speakers move between them freely: Pienso / Creo / Opino que deberíamos ir (I think / believe / am of the opinion that we should go). However, there are clear contexts where only one verb is correct — and using the wrong one signals a learner's ear.

• Only pensar: 'Pienso ir mañana' (I plan to go tomorrow). Neither creer nor opinar take a bare infinitive for intention.
• Only pensar: 'Pienso en ti' (I am thinking of you). Creer en ti = I believe in you (different claim). Opinar en does not exist.
• Only creer: 'Creo en Dios' (I believe in God). Faith and trust constructions use creer exclusively.
• Only creer: '¡No me lo creo!' (I cannot believe it — colloquial disbelief). Pensar and opinar cannot replace creer in this fixed expression.
• Most natural — opinar: 'Se me pidió que opinara' (I was asked to give my opinion). Neither pensar nor creer carries this formal sense of being asked to declare a position.
• Most natural — pensar: '¿Qué piensas hacer?' (What do you plan to do?). Creer and opinar do not work with bare infinitives.
• Most natural — creer: 'Creo que te equivocas' (I think you are wrong — said with conviction). Pensar is softer; opinar sounds stiff in a casual argument.

Useful fixed expressions

• Pensar mal de alguien = to think badly of someone
• Pensar bien de alguien = to think highly of someone
• Sin pensarlo dos veces = without thinking twice
• ¡Ni lo pienses! = Do not even think about it
• Dar que pensar = to give food for thought
• Creer a pies juntillas = to believe blindly / without question
• Ya lo creo = Of course / Absolutely (strong affirmation)
• ¡No me lo creo! = I cannot believe it! (disbelief)
• Opinar diferente = to disagree / hold a different view
• Pedir la opinión = to ask for someone's opinion (formal)

Common errors to fix

• Wrong: 'Creo ir a la playa mañana.' → Correct: 'Pienso ir a la playa mañana.' (intention = pensar + infinitive, not creer + infinitive)
• Wrong: 'No creo que viene.' → Correct: 'No creo que venga.' (negation of creer requires subjunctive mood)
• Wrong: 'No pienso que es así.' → Correct: 'No pienso que sea así.' (the same subjunctive rule applies to pensar)
• Awkward: '¿Qué opinas de cenar aquí?' for a casual suggestion → Better: '¿Qué piensas de cenar aquí?' or '¿Te parece bien cenar aquí?'
• Wrong: 'Creo en que tiene razón.' → Correct: 'Creo que tiene razón.' (creer en = to believe in; creer que = to believe that — never combine both prepositions in one sentence)

Practice: pensar, creer, and opinar in context

Keep practising with MuyVerbs

The fastest way to internalise pensar, creer, and opinar is to encounter each in enough real sentences that the right choice becomes intuitive. MuyVerbs covers both pensar and creer in the quiz and learning path — with conjugated forms across all 18 Spanish tenses at /spanish-verbs/pensar-conjugation/ and /spanish-verbs/creer-conjugation/. The full 3,015-verb library also includes opinar and every other opinion verb you will encounter.

For related verb-choice challenges, the blog post /blog/creer-pensar-indicative-subjunctive-spanish/ goes deep on the subjunctive flip after negated creer and pensar — the indicative vs subjunctive question that this guide only touched on. If you are working on Spanish knowledge vocabulary more broadly, /blog/saber-vs-conocer-spanish-guide/ covers another classic three-way confusion for English speakers — when 'to know' becomes saber versus conocer.