"How about a cup of coffee" language function is...
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Explanation:
Is "Can I have a cup of coffee?" polite? What if I ask a store employee, "Can I have something?"
Answer:
Topic-prominent language
Although we call it a subject, its position is not for subjects, the actor, only. A topic can also be in the position. A topic may not be an actor, but the one which the sentence is about. Let’s take an example: You bumped into a friend after lunch. Your friend asks you, “Hey, how about a lunch?” You might want to say, “Lunch? I already had it. How about a cup of coffee?” The first part of this speech can be understood, ‘As for (or, speaking of) lunch, I already ate it.’