Do you remember me telling you we are practicing non-verbal spells, Potter?"
"Yes," said Harry stiffly.
"Yes, sir."
"There's no need to call me "sir" Professor."
The words had escaped him before he knew what he was saying.

Is it true that you shouted at Professor Umbridge?"
"Yes."
"You called her a liar?"
"Yes."
"You told her He Who Must Not Be Named is back?"
"Yes."
"Have a biscuit, Potter.

Death's got an Invisibility Cloak?" Harry interrupted again.
"So he can sneak up on people," said Ron. "Sometimes he gets bored of running at them, flapping his arms and shrieking...

Yeah you can have a word," said Harry savagely. "Good-bye.

Why were you lurking under our window?"
"Yes - yes, good point, Petunia! What were you doing under our windows, boy?"
"Listening to the news," said Harry in a resigned voice.
His aunt and uncle exchanged looks of outrage.
"Listening to the news! Again?"
"Well, it changes every day, you see," said Harry.

I was supposed to be waiting up here when you got back, only your Phoenix lot got in the way...”
“Yes, they do that,” said Dumbledore.