Nedarim 70 - January 3, 10 Tevet

If the husband/father ratified the vow by saying, "it will be ratified today," does that mean he means to nullify it for tomorrow? And if that is in fact the case, can he ratify for the day and then nullify for tomorrow? If that is not possible, as perhaps once ratified, it cannot be nullified, then if he says "It is nullified to you for tomorrow" did that mean 'I am ratifying it today and nullifying tomorrow' which is not valid or since he did not use any language of ratification, the nullification works? If it does not work, as it was ratified for the first day, which is the critical day, what if one ratified it only for an hour, would it be assumed that he meant that he was nullifying it after that and if so, would the nullification be able to work in that case as it is still the day he heard the vow? The Gemara tries to answer the last question from a Mishna in Nazir but the answer is rejected. The next Mishna compares the power of the father and fiance/husband when it comes to nullifying vows. If the husband dies, the father exclusively can nullify the vow, but if the father dies, the fiance cannot nullify vows that were made before his death. But when it comes to age, the husband is in a stronger position as he can nullify even once she is a bogeret and the father cannot. From what verse do we learn that the fiance doesn't get exclusive rights to nullify previous vows if the father dies? From what verse do we learn that the father does get exclusive rights to nullify previous vows if the fiance dies? What exactly is the case the Mishna is referring to where the husband can nullify exclusively if she is a bogeret? It is not a case where he betrothed her when she was not yet a bogeret and then she became a bogeret as the Gemara derives from a logical comparison of laws. But if the case is when he betrothed her when she was already a bogeret, that appears already in an upcoming Mishna? Two possible explanations are brought to explain why both Mishnayot are needed even though they teach the same halakha.