Como foi solicitado que as respostas fossem respondidas com palavras do texto, a resposta mais adeqada será em inglês.
1- It is a man, because the poem refers to a woman's beauty as, for example, according to the sentence: And then she'll ask me, "Do I look all right?" And I'll say yes, you look wonderful tonight.
2- She is getting ready to go out "She's wondering what clothes to wear
She'll put on her make-up
And brushes her long blond hair"
3- Because she wants to know if she looks alright: "And then she'll ask me, "Do I look all right?"
4- They went to a party to have fun: "We'll go to a party"
5- He felt wonderful: "And I'll say yes, I feel wonderful tonight"
6- He had a head ache: "I've got an aching head"
7- She looks wonderful in his eyes: "I say my darling, you were wonderful tonight"
8- One thing detected that could be a problem is the repetitive usage of the artistic license using verbs in the present and in the past at the same time, which will be considered a problem in matters of grammar for academic texts, not in the case of a poem. As an example see the following sentence "I say my darling, you were wonderful tonight".
9- It's late in the evening. É tarde da noite.
11- Did you feel alright?