he tried to explain that he couldn't explain

“What is the difference, Potter, between monkshood and wolfsbane?"At this, Hermi…”

“As Ginny and Hermione moved closer to the rest of the family, Harry had a clear…”

“Oh, come off it,” said Ron, striding over to her and whipping her results out o…”

“Well, you're expelling us aren't you?" said Ron."Not today, Mr. Weasley."Snape …”