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a.I'm afraid I've forgotten my book at home b. Hasn't the secretary come yet? c. Have you learnt the rhyme? d.They've already informed me about the accident e. Alan has worked in a bank for a year f. Have you ever ridden a horse? g. Kevin has already left for London h. We have seen some good films recently 2. a. B b. A c. B d. B e. B f. A 3. 1. Who has taken your umbrella by mistake? 2. What has Nick taken by mistake? 3. Why has Nick taken your umbrella? 4. Nick has taken your umbrella by mistake, hasn't he? 5. Has Nick taken your umbrella or book by mistake?