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LADY: I want some envelopes please.
STATIONER: Do you want the large size or the small size?
LADY: The large size please.
LADY: Do you have any writing-paper?
STATIONER: Yes, we do.
STATIONER: I don’t have any small pads. I only have large ones. Do you want a pad ?
LADY: Yes, please.
LADY: And I want some glue.
STATIONER: A bottle of glue.
LADY: And I want a large box of chalk, too.
STATIONER: I only have small boxes. Do you want one?
LADY: No, thank you.
STATIONER: Is that all?
LADY: That's all, thank you.
STATIONER: What else do you want?
LADY: I want my change.
当有前置定语修饰时，只能用the one。
Which do you want?—The red one.
你想要哪个?——那个红的。(Lesson 21)
当有后置定语修饰时，通常用 the one。
—The one on the shelf.
