How to Say "they believe" in Spanish
The most common Spanish word for “they believe” is “creen” — use 'creen' when expressing faith, strong conviction, or a deeply held belief in something or someone.
creen
KREH-enˈkɾe.en

Examples
Ellos creen en la justicia.
They believe in justice.
¿Ustedes creen en el destino?
Do you (all) believe in destiny?
Muchas culturas antiguas creen en múltiples dioses.
Many ancient cultures believe in multiple gods.
Who are 'they'?
'Creen' is the form for 'ellos' (a group of men, or mixed), 'ellas' (a group of women), and 'ustedes' (you all, formal or informal depending on the region).
Believing 'in' something
To say you believe in a person, idea, or concept, always use the little word 'en' after the verb. For example, 'Ellos creen en ti' (They believe in you).
Forgetting 'en'
Mistake: “Mis amigos creen la magia.”
Correction: Mis amigos creen en la magia. (My friends believe in magic.) When talking about faith or belief in a concept, you need to add 'en'.
piensan
pee-EN-sahnˈpjɛn.san

Examples
¿Qué piensan ustedes sobre el nuevo plan?
What do you all think about the new plan?
Ellos piensan viajar a España este verano.
They are planning (or thinking of) traveling to Spain this summer.
Mis amigos piensan que la película fue aburrida.
My friends believe that the movie was boring.
The E → IE Change
The vowel 'e' changes to 'ie' in almost all forms of the present tense (like 'pienso,' 'piensan,' 'piensas'), but not for 'nosotros' or 'vosotros' (pensamos, pensáis).
Thinking ABOUT vs. Thinking OF/BELIEVING
To talk about the subject you are mentally focusing on, use 'pensar en' (Ellos piensan en el futuro). To give an opinion, use 'pensar que' (Ellos piensan que es tarde).
Forgetting the Stem Change
Mistake: “Mis padres pensan ir.”
Correction: Mis padres piensan ir. Remember the vowel change (e becomes ie) in this form.
Mixing Prepositions
Mistake: “Piensan sobre el trabajo.”
Correction: Piensan en el trabajo. Use 'pensar en' when meaning 'to meditate on' or 'focus on'.
Opinion vs. Conviction
Related Translations
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