Used to indicate ability or permission in the past.
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1. I listened closely but could not hear a sound. (±Í¸¦ ±â¿ï¿´Áö¸¸ ¾Æ¹«·± ¼Ò¸®µµ µé¸®Áö ¾Ê¾Ò´Ù) 2. He asked me if he could go home. (±×´Â Áý¿¡ µ¹¾Æ°¡µµ ÁÁÀ¸³Ä°í ³»°Ô ¹°¾ú´Ù) 3. I could be drinking water. (¸¶Ä¡ ¹°À» ¸¶½Ã°í ÀÖ´Â °Í °°´Ù) 4. I could have danced for joy. (±â»µ¼ µ¢½Çµ¢½Ç ÃãÀ» Ãß°í ½Í¾ú´Ù) 5. I could have done it if I had wanted to. (ÇÏ·Á°í ¸¶À½ ¸Ô¾úÀ¸¸é ÇÒ ¼ö ÀÖ¾úÀ» ÅÙµ¥)