http://www.buzzle.com/articles/thank-you-letter-to-teacher.html
There's a sample letter here (scroll down a bit) to show you the format. It'll give you an idea of the level of formality of language to use, too, but you'll be writing the content of the letter for your own purpose, not for thanking the teacher.
If you would like someone to look over your letter after you have written it, be sure to post it.
guidelines on how to write a letter to your teacher inviting her for your birthday party.
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I hate your this message
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