is a thesis statement one sentence?
yes, it usually is
yes
In the papers you are likely to be writing now, yes. That helps keep you focused. Later on, as you write at the university level, you will find that this is not necessarily so. The thesis may be complex enough that it takes more than a single sentence to adequately explore it, and/or you may be presenting it in such a manner that you choose to develop it as such.
Keep your thesis clear and concise and make sure to prove every point you mention in the thesis.
You might find the info here useful as well: http://www.youtube.com/watch?v=5HePQWodWiQ It's a set of slides detailing the parts of a thesis statement. Another student posted it this morning, and I spotted it. Thought you might like to take a look.
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