Indican la causa o razón de algo: because, because of, since.
Ejemplo.
Because more than 90 percent of skin cancers occur on areas regularly exposed to ultraviolet adiation (UV), you lower your chances of
getting this cancer if you use sunscreen when you are exposed to UV radiation and protect your eyes and lips.
Curso de Comprensión de Lectura en Inglés
CELE - UNAM Todos los derechos reservados UNAM 2006