Answer:
Credential is the word which you require.
Answer: He treats him badly by cursing him with pains and behaving in a patronizing or superior manner toward him.
Explanation: Prospero treats Caliban as a slave. Caliban's speech states Caliban's point of view of his treatment by Prospero early on in the play, and the audience needs to keep this in mind throughout the remainder of it.
Metaphors are comparing unlike things without the words like or as.... simile is comparing thing using like and/or as
Certain
because disappointed isn’t as related to perplexed so it won’t make sense.