Name the following passages in Young Goodman Brown: one that embodies plot, one that embodies setting, and another that embodies symbolism.

Since the setting is central, start there: Look at Brown's first entry into the forest, in the paragraph beginning " With this excellent resolve for the future…"
Symbolism is found many places, but most clearly in relation to Brown's wife. Look at the crisis: Faith! Faith!'' cried the husband, look up to heaven, and resist the wicked one.''
As for plot, that's actually harder, because the plot is so symbolic/allegorical. I'd actually go with this one: His head being turned back, he passed a crook of the road, and, looking forward again, beheld the figure of a man, in grave and decent attire, seated at the foot of an old tree. He arose at Goodman Brown's approach and walked onward side by side with him.

This sums up the problem (Goodman looking the wrong way), the path he's walking, both literal and metaphorical, and the threat: the devil.

Greg