Say hello, send a smiling face, and just say "Hello, teacher". Too much nonsense is not appropriate. From the teacher's point of view, adding teachers and students to WeChat is for their own work and can communicate with students in time. Students and teachers add WeChat to facilitate the reflection and solution of various problems in the school. No one will chat casually.
How to say it specifically should be based on your own reality. If you are still a child in infancy, you can teach a sentence, you are a student, and you should be able to do the minimum greeting without teaching. Don't be too rigid and flexible, learn to improvise.
Say hello to the teacher:
1. Hello, teacher. I'm glad to chat with you and pay my respects. It fits perfectly.
2. Hello, teacher. I am xxx's parents. You usually have a hard time educating your children. If your child doesn't behave well, we will communicate at any time.
3. Hello, Teacher X, I'm XXX's parents. Please help my children in their future study and life.
4. Hello, teacher. I am xxx's parents. In order to educate children to learn to be human in the future, parents can communicate in time. I hope you can exchange feedback with me and let us work together to build a better future for our children!