When the word "teach (jiāo) to learn" is pronounced in the first tone, "teach" is a verb, which means to teach students to learn their lessons. The word "teach" here is a verb, which means to impart knowledge or skills to others, such as teaching classes, singing, teaching children to read, and teaching apprentices by teachers.

When the word "jiao" is pronounced in the fourth tone (double tone), "jiao" is a noun, indicating the process of teachers imparting knowledge and skills to students. For example, the word "learning from teaching" refers to the process that teachers not only make students progress, but also make themselves grow (improve) by imparting knowledge and skills to students. When "Jiao" is pronounced in the fourth tone, it is not used alone in modern Chinese except as an imperative word or surname. Usually it needs to be combined with other morphemes to form a compound word, such as "teaching", "education", "enlightenment", "teaching reform", "discipline", "consultation" and "being taught" in verbs.