Cause that's really the only way these queries made any sense:
1. How do I query you?
Well, uh, lemme see.
On second thought, don't bother. This question demonstrates a frightening inability to do any kind of scouting around at all. This bodes ill for presenting yourself as someone I'd want to work with. By and large my clients are bunch of ferociously talented people who love to dig into things and figure out how they work be they sentences, novels, query letters or vampire shapeshifting mechanics.
2. What can you do for me?
Don't put this question in a query letter. Not even if you have the Nobel prize in literature. You can talk about what you're looking for, your goals etc if you must (but even then, NOT in the query letter cause I really only care about the writing at that point).
IF we get to the point that I would like to offer you representation I am perfectly prepared to discuss the benefits of having an agent in general and me in particular. Until that point, this kind of question is prima facie evidence of a person who is tone deaf about how words work. Again, that bodes ill.
3. I've adapted a screenplay.
I don't care if you adapted a haiku to get the novel. And if you adapted a screenplay my first question is was it YOUR screenplay. You might think that an obvious thing, but it's not. I get fanfic kinds of things in here ALL the time. People don't know they can't write novels about Mickey Mouse becoming Amish and moving to the country with Minnie and Pluto. Well, they can write them, but I sure as hell won't consider them. If you need an explanation of why, let me know.
I think these queries annoy the hell out of me because it's so damn easy to figure this stuff out. There are a gazillion blogs, a myriad of websites, and a dozen books on how to write a query. This stuff isn't even the hard part.
I need a drink.
Thank god for Eric Stone's donation to the cause: