Now Parvati was not stupid; in truth, she was every bit as smart as her studious sister. But people tended to forget this, because Parvati was much more sociable than her sister. Anyway, now smart Parvati analysed the clues and replied, "I’m almost sure Potter and Granger aren’t on the train. And if they’re not on the train, I’m sure they won’t be at Hogwarts when we get there."