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If you mean the line "the sun for sorrow will not show his head", it's a personification.
Juliet is captivated by Romeo's lyrical and poetic language as well as his declaration of love. She responds with equal passion and expresses her feelings for Romeo in a poetic manner. Juliet becomes enamored with Romeo's words and quickly falls in love with him.
iambic Pentameter
All of them.
It is a play, so no such physical description is given
It is probably poetic justice that Tybalt, the bully swordsman who was looking for a swordfight with Romeo, ended up getting killed by him in a swordfight. It didn't work out so well for Romeo, though.
Not in her job description.
The nurse's description of the fight and Tybalt's death leads Juliet to believe that Romeo has been killed. She interprets the news of Tybalt's death as a result of a confrontation with Romeo, and this misunderstanding causes her to despair.
Mercurtio was one of Romeo's friends. He was very poetic and had plenty of 'poetic' speech throughout the play before he got...killed in the fight where Romeo killed Tybalt after Mercurtio was killed by Tybalt. (Tybalt was Juliet's cousin).
She loves him because it is a love story between romeo and Juliet. Then Juliet kills herself over Romeo's death so obviously she loves him very dearly!
Cosmic irony
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