The repetition of the phrase "They've been through all that before" contributes to the theme by emphasizing conflict and difficulty.
What is the theme of "Shopping"?
In this story, the main theme is the difficulties experience as part of motherhood and the conflict between a mother and her daughter.
What is the purpose of the phrase "They've been through all that before"?
The main purpose is for the author to emphasize how difficult and conflicting can be the relationship between the mother and her daughter.
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