I don't understand the use of "did" here. I am confused whether it should be did or does.
I wonder what my speech would be. And if Bill would help me with it if he didn’t go to New York and write plays.
Also will the construction with "will" be
Bill will help me with it if he doesn’t go to New York.
It's from "Perks of Being a Wallflower". Bill is Charlie (the narrator)'s teacher. The book is in the form of letters written by Charlie (not to Bill). In previous letter Charlie mentioned that Bill wants to go to New York and write plays but the decision isn't final. Now in this letter Charlie is imagining future. He's thinking about graduation speech.