through: preposition.
examples: I used a knife to cut through the watermelon. I walked through the park at a leisurely pace.
throw: verb.
example: Some major league pitchers throw the ball at speeds exceeding 90 miles per hour.
threw: verb; past tense of throw.
example: I threw the ball to the first baseman.
Through and threw are homophones, or words that sound the same but are spelled differently. Sale and sail, weigh and way are other pairs of homophones.
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I never thought anyone could confuse through/threw. They’re soooo different how could a writer use one when the other is called for? I was wrong. I found one instance, made by an actual, real live professional write, on Yahoo. You can see it on my blog, Terribly Write or go directly to the post at http://terriblywrite.wordpress.com/category/confused-words/threwthrough/