you do this very well,but you have things is not very well

正确语法要这样说：
You do this very well,but there are also things that you don't do well
但还有一个委婉的（并比较好的）说法：
You do this very well,but you also have things that can be improved
can be improved = 可以改善
也希望点击“选为满意答案”及时采纳,
再问： 后面一句可以不可以but also things you dont do well
再答： 不可加 things that can be improved 就是 things you don‘t do well 的意思 是委婉的表达方式