文字水平很高怎么说英语

If you want to say that someone's language skills are very high in Engpsh, you can say that they have "excellent command of the Engpsh language" or that they are "fluent in Engpsh." You could also say that they have "advanced proficiency in Engpsh" or that they are "highly proficient in Engpsh." Alternatively, you could say that they have a "native-pke mastery of Engpsh." These are all ways to express that someone has a high level of skill in the Engpsh language.