37. Learn the extremely useful idiom “tengo que . . .”
It means “I have to . . .” You say, “Tengo que trabajar.” I have to work. “Tengo que limpiar la casa.” I have to clean the house. “Tengo que salir.” I have to leave. The beauty of “tengo que” is that you use the verb infinitive; you don’t conjugate the verb but you give a whole sentence of information.