The best answer is to say thank you first, and then write down some shortcomings of the students. Finally, if you have any questions about the teacher, ask him or her for advice and supervision.

The model essay is as follows (just written two days ago):

First of all, I am very grateful to the teacher for teaching him and giving him great help in his study. The school provides such a platform for our parents to better understand his situation at school and communicate in time.

Write again: What's wrong with his study (for example, whether he has a partial subject or something else, as long as it is related to his study). I hope the teacher can give him more advice and supervision in these aspects, so that his study can go up a storey still higher. thank you

Note: Although it is somewhat similar to what is provided online, I think it is ok to write this way. In fact, writing parents' opinions just tells the teacher what you are thinking. It's nothing.

Teacher x:

I have carefully read my child's report book and your comments and opinions (if not, don't). Xxxx can make a little progress because of your education and concern for him. We are very grateful. We have been paying close attention to children's moral, intellectual and physical education. He can take good care of his family life and make good use of his study time, but sometimes he is willful. For his faster progress, we will actively cooperate with the teacher's education. Besides, we would like to suggest to the school. ...

Thanks again, teacher.

Signature of parents. Dating.