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1. I think I've heard / been hearing that song before.
2. They haven't arrived / been arriving yet, but they should be here soon.
3. You've written / been writing that e-mail for over an hour. How long is it going to take you?
4. Have you talked / been talking on the phone since eight o'clock?
5. Jo has already invited / been inviting Shirley to dinner.
6. I've read / been reading an interview with Brad Pitt, but I haven’t finished it yet.
7. Have the boys played / been playing computer games since this morning?
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