A teacher helped me a lot. How can I text him to thank him?

Just to express some gratitude to the teacher, what would happen without the teacher, thank the teacher and so on.

Extended data:

School (English: school) refers to an organization in which educators systematically carry out educational activities for the educated in a planned and organized way. The name originated in the Republic of China. School education is a purposeful, systematic, organized and planned social activity carried out by full-time staff and specialized institutions. Its direct goal is to influence the physical and mental development of the educated, and finally make the physical and mental development of the educated reach the predetermined goal. School education refers to various educational activities accepted by the educated in various schools and is an important part of the education system. The specific activities of school education are influenced by social needs and must conform to the trend of social development.