Websites with printable kana exercises?

I am learning kana right now, and I have 2 short workbooks for Hiragana and Katakana. But I am looking for additional practice. I need practice writing sentances; so I am not looking for flashcards or drills for writing single syllabus.

Also if there are any good website for learning about sentence structure, that would be great too.

Thank you ^^

Via the following link you find kana charts and flash cards and some other valuable resources made available by the Japan Times:

http://genki.japantimes.co.jp/self/self.en.html

(when I started out learning I just wrote down words and sentences I came across, or wrote down lyrics in hiragana to learn to sing along with the music :o)

About sentence structure, you might have a look at Tae Kim's grammar guide.
http://www.guidetojapanese.org/
In the first chapters he explains sentence structure, the usage of the particles and similar. (Don't be scared by the table of contents, you can just start with the introduction and read as far as you want to at the time being. I really like his approach and also go there everytime I come across a sentence pattern I don't fully understand.)