要說英文嗎? 我也來>w<
If you really want to know where you did wrong, you may want to trace back all the comments that you made in others' posts (52... well, I think it's not too difficult) and see if there is any upside-down thumb at the right hand corner of your comment. If so, that's where your points are being deducted.
Same as 喔喔 san, I also think that the best way to improve your comment is first you should know how to type Chinese. Even for someone who know how to read English, I think they also prefer to see Chinese here rather than English.
Good luck!