Language is used to exchange information, but it means far more than that. It is also employed to establish and maintain social identity and gender differences. Language has varieties. Only by acquiring the variety of language a speech community adopts can a person be accepted and establish a target social identity and gender differences. The movie My Fair Lady is a good illustration to this point, and Eliza’s experiences of being transformed from a poor flower girl to a charming“princess”are cited in this paper. Both linguistic features like phonology, grammar, intonation, words manners topics and so on will altogether contribute to the construction of social identities and gender differences. The ultimate goal is to cultivate people’s awareness of so-cial identities and gender by conscious selection of language varieties.