If the students themselves are not the kind of people who are particularly good at expressing their feelings, or can't think of any suitable blessing language. You can express your blessing to the teacher in the simplest way.
For example, write on the greeting card: Dear teacher, Happy Teachers' Day. Then, write the words student XXX at the bottom. Of course, you can add one or two other wishes, such as wishing you good health and happiness forever. For primary school students, it is entirely possible to write such a greeting.
Creative writing
If students are outstanding in art or calligraphy, they can be creative in greeting words when sending cards to teachers on Teachers' Day.
For example, you can express your blessing to the teacher in the form of a cartoon, draw a cartoon based on the teacher, and match it with warm blessing words. You can also write your teacher's day wishes in different calligraphy forms, so that teachers can feel that you attach importance to this friendship between teachers and students.
A more romantic way of writing
Sometimes students and teachers can be a little romantic. Especially those young teachers who have a harmonious relationship with students, students can deliberately create some romantic atmosphere when writing greeting cards.
If she is a female teacher, students can praise the teacher with some beautiful words, and of course, they can also describe the male teacher with various words such as handsome. In short, if the teacher-student relationship is good, you can express your teacher's day wishes in some romantic language.