Mother tongue transfer is in the process of acquiring a second language. The learner's first language, that is, the use of the mother tongue, will directly affect the acquisition of the second language, and it will actively promote or negatively interfere with it. Based on the above definitions, the following are mother tongue transfers:. ['The texts of Japan and South Korea contain a large number of Chinese characters, and Chinese culture in history is the source of their development.', 'A moved to foreign countries with his parents when he was five years old.', 'Englishman B is particularly difficult to master quantifiers when learning Chinese.', 'C grows up in a bilingual environment and is fluent in both languages in life and study.']