A person's’s identity is so important within the world of Le Morte d’Arthur. Each character is defined not only by his familial relations, but also by his abilities, whether on the battlefield, as a lover, or as a leader. A person is also defined by his loyalties to his country or liege. Knights are usually defined with epithets about their abilities or loyalties, sometimes given through fate, sometimes through their own accomplishments. Many people struggle with identities given to them by fate or circumstance. For instance, when Arthur was young, he thought of himself as the adopted son of a landowner and knight, not as the heir to all of England. After Arthur learns he is the son of Uther Pendragon and Igraine, he has a hard time accepting his identity, even though that identity compels him to take power meant for him by fate. Similarly, his son Mordred also has difficulty accepting his identity - though he is predestined to kill his father, he is bothered by the Archbishop of Canterbury's statements on his sinful conception.
When he says "My will to her consent is but a part; An she agree, within her scope of choice Lies my consent and fair according voice." He is saying here that his consent to Juliet and Paris' marriage is "but a part" of the decision, so he believes that her choice is also needed. He says that, while his "consent and fair according voice" may play a part in her choice, she still has a choice, free will.
Yes - the tense of a verb is tacked onto the end.
