Sword? Haven't got a sword. That boy has, though. He'll lend you one.

Snape is vindictive, he's cruel. He's not a big man. But he loves. I like him, but I'd also like to slap him hard.

I don't mean to be rude—" he began, in a tone that threatened rudeness in every syllable. "Yet, sadly, accidental rudeness occurs alarmingly often," Dumbledore finished the sentence gravely.

If he doesn't stop trying to save your life he's going to kill you.

Help only comes to those who ask for it.

Karakarof spat onto the ground at Dumbledore's feet. In one swift movement, Hagrid seized the front of Karkaroff's furs, lifted him into the air, and slammed him against a nearby tree.

The most important thing is to read as much as you can, like I did. It will give you an understanding of what makes good writing and it will enlarge your vocabulary.