grammar.prepositions.verbs-with-en-con
Verbs with en and con: pensar en, soñar con, confiar en
En: pensar en, confiar en, insistir en, tardar en, consistir en, fijarse en. Con: soñar con, contar con, casarse con, encontrarse con, cumplir con.
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Explicación
Some verbs lock onto en: pensar en ('think about', pienso en vos), confiar en ('trust'), insistir en, consistir en, fijarse en ('notice'), tardar en + infinitive ('take time to', tardó en responder), quedar en ('agree to'). Others lock onto con: soñar con ('dream of/about'), contar con ('count on'), casarse con, cumplir con, encontrarse con.
Pensar is worth a closer look, because the preposition changes the meaning: pensar en = think about someone/something; pensar de = have an opinion about (¿qué pensás de…?); and pensar + infinitive (no preposition) = plan to (pienso viajar en julio).
The catch for English and French speakers is that the Spanish preposition often differs from theirs — 'dream of' but soñar con, 'think about' but pensar en — so the safest approach is to memorize each verb together with its preposition as a single vocabulary item.
Ejemplos
I trust your judgment.
Región: global
I dreamed about the Tarija house.
Región: global
We agreed to meet on Saturday; I'm counting on you.