Here are some examples of how you might use "creer" in a sentence:
* Yo creo que él está diciendo la verdad. (I believe that he is telling the truth.)
* ¿Crees en Dios? (Do you believe in God?)
* No creo que sea una buena idea. (I don't think it's a good idea.)
Let me know if you have any other Spanish words you'd like translated!