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¡¡¡¡a. What can it be?
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¡¡¡¡b. Can he still be in the office?
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¡¡¡¡c. It can't be true.
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¡¡¡¡a. When she was young, she could stay out until ten o'clock.
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¡¡¡¡b. She could be gloomy about the future at times.
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¡¡¡¡c. I ran fast, but couldn't catch the bus.¡Ê²ÄǽÀ¡Ë
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¡¡¡¡a.*I ran fast, and could catch the bus.
¡¡¡¡b. I ran fast, and able to catch the bus.
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¡¡¡¡a. *She could stay out until ten o'clock yesterday.
¡¡¡¡b. She was allowed to stay out until ten o'clock yesterday.