Creo que la película "Up" es excelente. | I believe/think (FOR A FACT) that the movie "Up" is excellent. |
No hay duda que UNC-Chapel Hill tiene un equipo de baloncesto excepcional. | There is no doubt that UNC-Chapel Hill has an exceptional basketball team. |
Es obvio/ cierto/ verdad/ hecho que los perros son mejores que los gatos | It's obvious, certain, true, a fact dogs are better than cats. |
Yo sé que mis estudiantes estudian mucho. Tú sabes que dos más dos son cuatro. |
I know (FOR A FACT) that my students study a lot. You know (FOR A FACT) that two plus two is four. |
Pensar & Creer in Spanish express certainty, unlike the English "to think" or "to believe" which can be used to express uncertainty.
We also do not use the subjunctive when discussing people or things we know exist:
Hay una secretaria que habla español. | There is a secretary who can speak Spanish. |
Busco al hombre que tiene la llave. | I'm looking for the guy who has the key. [I know there is such a guy; he exists.] |