Which line in this excerpt from Amy tans mother tongue shows that tan changes her language depending on the audience

The line in the above excerpt from Amy Tan's "Mother Tongue" that shows that Tan changes her language depending on the audience is: "The talk was about my writing, my life, and my book, The Joy Luck Club, and it was going along well enough, until I remembered one major difference that made the whole talk sound wrong. My mother was in the room."