How+do+these+warnings+anticipate,+or+foreshadow,+Yolanda's+experience+on+her+trip?

At first, Yolanda does not want to take any notice of what her aunts are telling her, but I think these warning do make an effect on her and stick in the back of her mind. At first she is confident about her journey and excited about finding her antojos, but she does know she should be careful. Later when she sees the two men, she remembers what her aunts said and she is scared. They could be thought of as "boogeymen" and Yolanda is so scared she cannot speak.

The way Yolanda's aunts worry in the beginning of the story, and the how Yolanda chooses to ignore them, makes the audience feel as though something bad nay happen. We learn that what Yolanda is doing is very dangerous, so we are anxious to find out if her journey ends safely.