Verbos + el infinitivo
verbs that are not conjugated
end in –ar, -er, or –ir
Many verbs are followed by a
preposition before
continuing the sentence with
an infinitive
Prepociones comunes:
de—of, from
en—in, on
para – for the purpose of , in
order to
por – for, by
Reglas: el infinitivo con “a”
The preposition “a” is required
before any infinitive that follows a
verb of
 Beginning
 Movement
 Teaching/learning
 helping
Reglas: el infinitivo con “a”
 Beginning:
 Comenzar a – to begin to
 Empezar a – to begin to
 Movement:
 Ir a – to go to
 Correr a – to run to
 Venir a – to come to
 Teaching/Learning:
 Enseñar a – to teach to
 Aprender a – to learn to
 Helping:
 Ayudar a – to help (to)
Reglas: el infinitivo con “a”
 Comienzan a cantar.
 They begin to sing.
 Corren a cerrar las ventanas.
 They run to close the windows.
 Aprendemos a hablar español.
 We’re learning to speak Spanish.
 Ella me ayuda a bailar.
 She helps me (to) dance.
Reglas: el infinitivo con “de”
 The preposition “de” is required before any infinitive
that comes after one of the following four verbs:
 Acabar de – to have just
 Cesar de – to stop
 Dejar de – to quit, to stop
 Tratar de – to try to
Note: Olvidar is frequently followed by “de” when it is
not reflexive:
Olvidar de – to forget to
Olvidarse – to forget to
Reglas: el infinitivo con “de”
 Acaban de cenar.
 They have just eaten dinner.
 Cesó de llover.
 It stopped raining.
 Juan dejó de darme el dinero.
 Juan stopped giving me money.
 Trataron de llamarme.
 They tried to call me.
Reglas: el infinitivo con “de”
Olvidé de hacer la tarea.
I forgot to do the homework.
Se me olvidé hacer la tarea.
I forgot to do the homework.
Reglas: sin preposición
 The following verbs are used without a preposition before an
 Deber – ought to, must
 Dejar – to let, allow, leave
 Desear – to wish, desire
 Esperar – to hope, expect to
 Necesitar – to need
 Oír – to hear
 Pensar – to think, plan or intend to
 Poder – to be able to
 Preferir – to prefer
 Prometer – to promise
 Querer – to want
 Saber – to know (information)
Reglas: sin preposición
Debes hacer la tarea.
You should do the homework.
Pienso ir al cine.
I’m planning to go to the
Otros verbos con prepositiones
 soñar con—to dream about
 Insistir en – to insist on, insist upon
 Sueño con ser astronauta.
I dream about being an astronaut.
 El profesor insiste en darnos examenes.
The teacher insists on giving us tests.
If a verb is normally followed by
the subjunctive, but DOESN’T
have a “que” you must use the
 Quiero salir contigo esta noche.
 I want to go out with you tonight.
 Quiero que tu salgas conmigo esta
 I want you to go out with me tonight.

Verbo + infinitivo