'Edith Smith is only thirty' 'Is she? I thought she was thirty-three' 'Edith's birthday was last Thursday' 'Was it? I thought it was last month' 'The Smith's house is worth thirty thousand pounds' 'Is it? I thought it was worth three thousand' 'Mr Smith is the author of a book about moths' 'Is he? I thought he was a matematician' 'I'm so thirsty' 'Ah, I thought you drank something at the Smith's' 'No. Edith gave nothing to drink' 'Shall I buy you a drink?' 'Thank you'