obliged to, to be, agradecer a.
observe, to, observar.
obtain, to, obtener.
occupy, to, ocupar.
occur, to, ocurrir, acaecer.
o'clock: it is one—— , es la una; it is two, three, four—— , son las dos, las tres, las cuatro.
of, de.
offer, oferto, m.
offer, to, ofrecer.
office, despacho, m. (place of business); oficio, m. (occupation).