I've been using livemocha.com for the last two days. Doing Japanese 101. I'm lesson 3 and they use the term korera wa(ha) ki desu(これらは木です。) I think it means these but, I don't remember every hearing it before or seeing it in textbooks. Am I mistaken? I've studied Japanese for three or so years and went there as an exchange student for 6 months. I may have come across it and just not noticed but anyone know if this is correct. I didn't think they used any different words for more than one thing. That's what my books always said.

Thanks Ben! I knew what the sentence meant, but I wasn't sure if it was a real word or if they made it up or had an error or something. Since I'd never seen it before. Thanks!