Zork (eat) a hamburger? -Yes, ... Has Zork eaten a hamburger? - Yes, he has. Zork and Zena (drink) a cola? -No, ... Have Zork and Zena drunk a cola? - No, they haven't.

Пример:

• Zork (eat) a hamburger? -Yes, he has.
• Has Zork eaten a hamburger? - Yes, he has.
• Zork and Zena (drink) a cola? -No, they haven't.
• Have Zork and Zena drunk a cola? - No, they haven't.