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Verbs paired with 'en'

When you learn a new Spanish verb, it is tempting to assume it connects to its object exactly as its English translation does. If English uses "about", you might look for the Spanish word for "about". If English uses no preposition at all, you might assume Spanish does the same.

This habit will lead you astray with a specific group of Spanish verbs that require the preposition en to connect to their object. Verbs like pensar and fijarse rely on en, regardless of the English phrasing. To speak naturally, you need to learn the verb and its preposition as a single unit.

Word list
pensarA2 to think pensar en = to think about centrarseB1 to focus centrarse en = to focus on concentrarseB1 to focus concentrarse en = to focus on confiarB1 to trust confiar en = to trust convertirseB1 to become convertirse en = to become, turn into enfocarseB1 to focus enfocarse en = to focus on fijarseB1 to notice fijarse en = to notice, pay attention to transformarseB1 to become transformarse en = to become, turn into confiar enB2 to count on confiar en = to count on, to rely on consistir enB2 to consist of consistir en = to consist of influirB2 to influence influir en = to influence involucrarseB2 to get involved involucrarse en = to get involved in abundarC1 to abound abundar en = to abound in, teem with entrometerseC1 to interfere entrometerse en = to interfere with, meddle in irrumpirC1 to burst in irrumpir en = to burst into, storm inmiscuirseC2 to interfere inmiscuirse en = to interfere in, meddle in
When English uses no preposition

English often connects a verb directly to its object, whereas Spanish sometimes requires a bridge. If you want to say "I trust you", you might be tempted to translate it word-for-word. However, the verb confiar needs en to connect to the person you trust.

Siempre confío en mi equipo.
(I always trust my team.)

The same rule applies to noticing a detail with fijarse or influencing someone with influir. Where English uses a direct object, Spanish requires en.

No me fijé en tu nuevo corte de pelo.
(I didn't notice your new haircut.)
El clima influye en mi humor.
(The weather influences my mood.)
When English uses a different preposition

Sometimes English does use a preposition, but it does not match the Spanish equivalent. In English, we think "about" things, focus "on" tasks, turn "into" other things, and have exams that consist "of" questions.

In Spanish, all these concepts are expressed with en. You will use it with pensar, concentrarse, convertirse, and consistir.

Estoy pensando en ti.
(I am thinking about you.)
Necesito concentrarme en mi trabajo.
(I need to focus on my work.)
La oruga se convirtió en mariposa.
(The caterpillar turned into a butterfly.)
El examen consiste en cien preguntas.
(The exam consists of a hundred questions.)
Watch out for changing meanings

The preposition en is specifically required when these verbs connect to a noun or pronoun. If the verb is followed by another action instead, the rules can change. For example, pensar en means "to think about" a noun or a person.

Siempre pensamos en las vacaciones.
(We always think about the holidays.)

However, if you want to say that you plan or intend to do something, you use pensar directly with an infinitive verb, dropping the en entirely.

Este verano pensamos viajar a España.
(This summer we plan to travel to Spain.)

Additionally, while these verbs heavily favor en, a few have accepted alternatives in certain regions or contexts. For instance, you will occasionally see influir paired with sobre, or involucrarse paired with con, but en is always a safe and natural choice.

Summary

Prepositions rarely map perfectly between languages. Rather than guessing based on English, treat the preposition as a core part of the Spanish word. Memorize pensar en and fijarse en as complete phrases, and you will always have the right connection ready to go.