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How does the poem's mood and tone change in each of these stages of “o captain! my captain! ” by walt whitman? (i need an answer asap )

Read the excerpt from act 1, scene 3, of julius caesar. cassius. am i not stayed for? tell me. cinna. yes, you are. o cassius, if you could but win the noble brutus to our party— cassius. be you content. good cinna, take this paper and look you lay it in the praetor’s chair, where brutus may but find it. and throw this in at his window. set this up with wax upon old brutus’ statue. all this done, repair to pompey’s porch, where you shall find us. is decius brutus and trebonius there? cinna. all but metellus cimber, and he’s gone to seek you at your house. well, i will hie, and so bestow these papers as you bade me. cassius. that done, repair to pompey’s theatre. what is cassius’s motivation for sending brutus the letter? cassius wants to make sure that cinna is on his side. cassius wants to reassure cinna that brutus will follow them. cassius wants to sway brutus to kill caesar. cassius wants to alert brutus about the conspiracy against him.

Julius caesar. [brutus.] with this, she fell distraught, and, her attendants absent, swallowed fire. cassius. and died so? brutus. even so. cassius. o ye immortal gods! [enter lucius, with wine and taper] brutus. speak no more of her. give me a bowl of wine. in this i bury all unkindness, cassius. cassius. my heart is thirsty for that noble pledge. fill, lucius, till the wine o'erswell the cup; i cannot drink too much of brutus' love. [exit lucius. enter titinius, with messala] brutus. come in, titinius; welcome, good messala. now sit we close about this taper here, and call in question our necessities. cassius. portia, art thou gone? brutus. no more, i pray you. what moral dilemma does brutus confront in this excerpt? brutus lets go of his anger toward cassius and forgives him. brutus decides that he will not mourn portia and will stay loyal to cassius. brutus decides that he is too angry at cassius to remain friends with him. brutus questions whether cassius's life should be ended.