How Do You Conjugate Pensar? | Full Tense Charts

Learning how to handle Spanish verbs often comes down to mastering a few specific patterns. The verb pensar, meaning “to think,” serves as a classic example of a stem-changing verb that follows specific rules depending on who performs the action and when it happens.

You use this verb constantly in daily conversation to express opinions, plans, or mental activities. Because it fits into the “boot verb” category, new learners often trip over the slight vowel shift in the present tense. Once you memorize that single irregularity, the rest of the conjugation follows a mostly predictable path.

This guide breaks down every tense you need to know, provides clear charts, and explains the specific contexts where pensar shifts its meaning slightly based on the grammar.

Understanding The Pensar Stem Change

Before looking at the full charts, you must grasp the mechanics of the stem change. Pensar is an -ar verb, but it is also an e-to-ie stem changer. This means the e in the stem (pens-) changes to ie when the stress falls on that syllable.

This change occurs primarily in the present indicative and the present subjunctive tenses. It affects all singular forms (yo, tú, usted) and the third-person plural (ustedes, ellos). It does not affect the nosotros or vosotros forms because the stress falls on the ending, not the stem.

If you visualize the conjugation table, the forms with the change make the shape of a boot or L-shape, which is why teachers often call these “boot verbs.” Remembering this visual cue helps you avoid adding the i where it does not belong.

Present Indicative Conjugation Forms

The present indicative is your go-to tense for stating facts, current thoughts, or habits. Since you use “I think” or “she thinks” frequently, this is the most critical set of forms to memorize. This is where the e-to-ie shift is most visible.

Subject Pronoun	Conjugation	English Translation
Yo	Pienso	I think
Tú	Piensas	You think (informal)
Él / Ella / Usted	Piensa	He/She thinks / You think (formal)
Nosotros / Nosotras	Pensamos	We think
Vosotros / Vosotras	Pensáis	You all think (Spain)
Ellos / Ellas / Ustedes	Piensan	They / You all think

Using The Present Tense In Context

You use these forms to express opinions or intent. In Spanish, saying “Pienso ir” translates to “I plan to go” or “I am thinking of going.” This usage makes the present tense versatile for discussing the near future as well.

• Express an opinion — Pienso que es una buena idea. (I think it is a good idea.)
• State a plan — Pensamos viajar mañana. (We plan to travel tomorrow.)
• Ask for thoughts — ¿Qué piensas tú? (What do you think?)

Past Tense Conjugations For Pensar

When discussing thoughts you had in the past, you must choose between the preterite and the imperfect. The good news is that pensar is entirely regular in both past tenses. There is no stem change here; the stem remains pens- throughout.

The Preterite Tense

Use the preterite to describe a specific thought at a specific moment, or the act of “dawning on” someone. It often implies the beginning or end of a thought process.

Subject	Conjugation	Example
Yo	Pensé	Pensé en ti ayer. (I thought of you yesterday.)
Tú	Pensaste	¿Pensaste en la solución? (Did you think of the solution?)
Él / Ella / Usted	Pensó	Ella pensó rápido. (She thought quickly.)
Nosotros	Pensamos	Pensamos lo mismo. (We thought the same thing.)
Ellos / Ustedes	Pensaron	Ellos no pensaron en eso. (They didn’t think of that.)

The Imperfect Tense

The imperfect is used more frequently with mental state verbs like pensar. It describes an ongoing thought process in the past with no defined start or end. If you want to say “I was thinking,” you generally use the imperfect.

• Yo pensaba — I was thinking / I used to think.
• Tú pensabas — You were thinking.
• Él/Ella pensaba — He/She was thinking.
• Nosotros pensábamos — We were thinking.
• Ellos pensaban — They were thinking.

For example, “Yo pensaba que eras alto” means “I thought (was under the impression) that you were tall.”

How Do You Conjugate Pensar In The Subjunctive?

The subjunctive mood expresses doubt, desires, or hypothetical situations. If you say “I don’t think that…” (No pienso que…), the verb in the following clause usually takes the subjunctive. However, pensar itself often appears in the subjunctive when someone else triggers the thought (e.g., “I want you to think”).

The stem change e-to-ie returns in the present subjunctive, following the exact same pattern as the present indicative.

Subject	Present Subjunctive
Yo	Piense
Tú	Pienses
Él / Ella / Usted	Piense
Nosotros	Pensemos (No change)
Vosotros	Penséis (No change)
Ellos / Ustedes	Piensen

A common context for this is a negative command or a wish. For instance, “No quiero que lo pienses demasiado” (I don’t want you to think about it too much).

Imperfect Subjunctive

This form is regular. It stems from the third-person plural of the preterite (pensaron).

• Yo pensara (or pensase)
• Tú pensaras
• Nosotros pensáramos

Future And Conditional Tenses

The future and conditional tenses are the easiest to master because pensar behaves as a standard regular verb. You do not drop or change any letters; you simply add the endings to the full infinitive.

Future Tense

Use this to predict thoughts or state what you will think or plan to do.

• Yo pensaré — I will think.
• Tú pensarás — You will think.
• Él pensará — He will think.
• Nosotros pensaremos — We will think.
• Ellos pensarán — They will think.

Conditional Tense

Use this for hypothetical situations, translating to “would think.”

• Yo pensaría — I would think.
• Tú pensarías — You would think.
• Nosotros pensaríamos — We would think.

A classic usage example: “¿Qué pensaría tu madre?” (What would your mother think?).

Imperative And Continuous Forms

When learning how do you conjugate pensar, you cannot overlook commands and continuous actions. These add specific nuances to your speech.

The Imperative (Commands)

Telling someone to “Think!” requires the imperative mood. Since these are mostly based on the present tense, the stem change applies to the informal singular (tú) and the formal forms.

• Tú (Affirmative): ¡Piensa! (Think!)
• Tú (Negative): ¡No pienses! (Don’t think!)
• Usted: ¡Piense! (Think! – formal)
• Nosotros: ¡Pensemos! (Let’s think!)
• Ustedes: ¡Piensen! (Think! – plural)

The Continuous (Progressive)

To say “I am thinking,” use the verb estar + the gerund of pensar. The gerund is regular: pensando.

• Estoy pensando en ti. (I am thinking of you.)
• Estaba pensando en salir. (I was thinking of going out.)

The Perfect Tenses

The past participle of pensar is pensado. Combine this with the helper verb haber.

• He pensado — I have thought.
• Habías pensado — You had thought.

Common Phrasal Uses Of Pensar

Knowing the conjugation is only half the battle. Pensar changes meaning depending on the preposition that follows it. Using the wrong preposition can confuse the listener.

Pensar En (To Think About/Of)

Use en when your thoughts are directed toward a person, object, or topic. Do not use de or sobre for general “thinking of” someone.

Example: Siempre pienso en mis abuelos. (I always think about my grandparents.)

Pensar De (To Have an Opinion About)

Use de (or sometimes sobre) when asking for an opinion. This is very specific to “What do you think of X?”

Example: ¿Qué piensas de este libro? (What do you think of this book? / What is your opinion?)

Pensar + Infinitive (To Plan To)

When pensar is followed directly by another verb (no preposition), it means “to plan” or “to intend.”

Example: Pienso estudiar mañana. (I plan to study tomorrow.)

Pensar Que (To Think That)

Use que to connect a thought to a clause. This introduces a specific belief or fact.

Example: Pienso que es tarde. (I think that it is late.)

Key Takeaways: How Do You Conjugate Pensar?

➤ Pensar is an e-to-ie stem-changing verb in the present tense.

➤ The stem change affects all singular forms and the third-person plural.

➤ Past, future, and conditional tenses follow regular -ar rules.

➤ Use “pensar en” for focusing on something and “pensar de” for opinions.

➤ “Pienso + infinitive” translates to “I plan to” do something.

Frequently Asked Questions

Is pensar a regular or irregular verb?

Pensar is a semi-irregular verb. It is regular in the past, future, and conditional tenses, but it has a stem change (e to ie) in the present indicative, present subjunctive, and imperative moods.

When do you use piense vs piensa?

Use “piensa” for the third-person singular indicative (he/she thinks) or the informal imperative (think!). Use “piense” for the first/third-person singular subjunctive or the formal command (you think! / let him think).

Does the stem change happen in the preterite?

No, the stem change does not occur in the preterite tense. You conjugate it as a regular -ar verb: pensé, pensaste, pensó, pensamos, pensaron.

How do you say “I plan to” using pensar?

You simply conjugate pensar in the present tense followed by an infinitive verb. For example, “Pienso comer” means “I plan to eat” or “I am thinking of eating.”

What is the gerund form of pensar?

The gerund (present participle) is “pensando.” It is regular and does not have a stem change. You use it with estar to form continuous tenses, like “estoy pensando” (I am thinking).

Wrapping It Up – How Do You Conjugate Pensar?

Mastering the conjugation of pensar unlocks a massive part of Spanish conversation. Once you are comfortable with the “boot” pattern in the present tense, the rest of the verb behaves predictably. Whether you are expressing a deep opinion using pensar de, making future plans with pensar + infinitive, or simply recalling a memory with the imperfect, this verb is essential for fluency.

Focus on practicing the e-to-ie shift in the present tense first, as that is where most errors happen. With consistent use, the difference between pienso and pensamos will become second nature, helping you speak with confidence and clarity.