¡Bienvenido, bienvenida, bienvenidos, bienvenidas! - Welcome! -- *Grammar note: Most words ending in -o are masculine and -a feminine. Those ending in -os are plural, masculine and -as are plural feminine.
(Yo) Me tengo que ir - I have to go.
*Hasta la vista - This would usually be stated when you do not expect to see the person
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