story: Tom ate a lot and got fatter and fatter. I asked him why he ate so much. He said it was because his wife, Mary, kept buying food. I asked Mary why she bought so much food. She said it was because Tom kept eating the food.
 selected sentence: She said it was because Tom kept eating the food.
Mary want(s) to avoid blame >Motivates> Mary says she buys too much food because Tom eats too much food