there are so many notebooks, it's horrific recently,i found the notebook is hot and is useful for studying a new languague. and i am glad to modify these written in Chinese,and when you do this,you can learn how to teach others your local language,and you really hope that what you do can help the learners. so, i also wrote a notebook in english this morning. i hope someone can read it and modify it, so the next time i won't make the same mistake. however,i wait no answer by now, and my topic has got down to the 7 page. what a pity! learning is a mutual process. i hope that we make progress together.