'She's a great English teacher' works better :)

"She teaches English well" is excellent. It means she explains well. "She is a good English teacher" is also good, but means something slightly different. It means she performs that role well. That role includes many things beyond explaining well.

She teaches English well. That is better phraseology. We never use 'teacher of' unless we wish to emphasize something. Instead, 'English' as an adjective is the normal way we describe a teacher. Imagine the following conversations: 1.A: What work does she do? B: She's a professor A: Oh, what kind? B: A professor of Mathematics .... At Oxford University. 2. A: What kind of work does he do? B: He's a maths teacher. A: Oh? Where? B: At Oxford Primary School. I hope that helps.

The meanings are different. She’s a good English teacher. (She has the attributes of a good English teacher) She teaches English well. (She’s good specifically at teaching English, but might have other negative qualities) He’s the best English teacher ever! (He teaches well, he’s likable, his class is enjoyable etc) I guess she taught French well but her class was no fun and most of the students disliked her.

Both expressions are grammatically correct and convey a similar meaning, but there is a subtle difference in emphasis. The expression "She is a good teacher of English" emphasizes the quality of the person as a teacher, suggesting that she possesses certain skills, knowledge, and abilities that make her effective in teaching English. It focuses on her role as a teacher rather than the actual process of teaching. On the other hand, the expression "She teaches English well" emphasizes the action of teaching itself and how effectively she carries out that action. It highlights her ability to communicate the subject matter clearly and help her students understand and learn. Therefore, both expressions can be used depending on the context and what you want to emphasize. However, the first expression is more focused on the person as a teacher, while the second expression is more focused on the action of teaching.