"I don't know, sir," said Harry.
Snape's lips curled into a sneer.
"Tut, tut -- fame clearly isn't everything."
He ignored Hermione's hand.
"Let's try again. Potter, where would you look if I told you to find me a bezoar?"
Hermione stretched her hand as high into the air as it would go without her leaving her seat, but Harry didn't have the faintest idea what a bezoar was. He tried not to look at Malfoy, Crabbe, and Goyle, who were shaking with laughter.
"I don't know, sir."
"Thought you wouldn't open a book before coming, eh, Potter?"
Harry forced himself to keep looking straight into those cold eyes. He had looked through his books at the Dursleys', but did Snape expect him to remember everything in One Thousand Magical Herbs and Fungi?
(Harry Potter and the Sorcerer's Stone)
It seems ‘would’ mean Potter’s will to read, not for the future possibility. Is this right?