I Solemnly Swear That I Am Up to No Good

Yeah, totally. I Solemnly Swear I Am Up to No Good.

So is it okay to use a contraction there? I'm up to no good? Or does it have to be spelled out? And does it have to be capitalised like that?

Okay, so I'm supposed to tell something on myself that would get me in trouble if anybody found out, right? Well, yeah, I've got something. In Carrow's class that day, when he'd put the Imperius curse on Dean and Hermione, and he was planning to get them sent away? After he blew up in flames, a bunch of people started shooting water out of their wands like they were trying to put it out, only they were really just trying to keep Carrow from realising who'd done what and to keep him off balance so he wouldn't start hexing people.

I didn't cast a water spell. I cast a spell that made some kind of burning oily stuff spray all over Carrow, and it made the flames flare up and go scary hot. I don't think it was even a proper spell, exactly; I think I just wanted to see Carrow burn for what he'd done, and my wand just did what I was thinking. You know what my wand's like now: that's the only time all year my wand's done anything I wanted it to.

And I totally meant to hurt him. I did.

So there. If I do something stupid to get us all in trouble, you can turn me in for trying to murder a teacher.