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Hermione speaking:
"All we'd need would be some Polyjuice Potion."
"What's that?" said Ron and Harry together.
"Snape mentioned it in class a few weeks ago--"
"Do you think we've got nothing...

I sure am having trouble with this book translation; here's an example.

The English sentence is:
"Do you think we've got nothing better to do in Potions than listen to Snape?" muttered Ron.
...