Spark notes is a great website to look for summaries of books. i Read those all the time and pass all my quizzes and tests.
It Is a compound sentence since you can choose to drive with us is an independent sentence and you can choose to walk with them the other independent sentence joined by the conjunction or
She relies on tom far too much. she doesn’t take into account the possibility that he MIGHT NOT BE ABLE TO HELP her, in spite of his willingness to do so.
answer: might not be able to help