Personally I prefer that , just feel free to use any language to express your feeling. As long as you feel comfortable, no matter it is in English or Chinese.
There are so many ways to learn English.
It's a good way to form the logic of thinking in English. You know what, in order to practice more, I once wrote diary in English. I know, I had made some progress on using this way. But, it's not an instant way.
Later one friend who can use English very smoothly and freely tells me that, because I didn't read pure English enough, and because nobody corrected my mistakes after I wrote all the staffs, I couldn't improve my English very fast. He thought the best way was, to write English paper, after that, somebody, like a native speaker could give you advise to improve your writing skills. Then, probably you could make some prompt progress.
Just share some feeling on it. ^_^