[-spond-/-spons-]
v to answer (= to reply);
responder a (un persona, or un littera, un question, etc. ) to answer (someone, or a letter, question, etc.);
responder a (un cosa) to correspond to (something);
responder de (un cosa) to answer, vouch for (a thing);
responder pro (un persona) to answer, vouch for (a person)