1. I am not certain what to do. (¾î¶»°Ô ÇØ¾ß ÁÁÀ»Áö ¸ð¸£°Ú´Ù) 2. She was certain that the young man had gone mad. (±×³à´Â ±× ÀþÀºÀÌ°¡ ¹ÌÄ£ °ÍÀÌ Æ²¸²¾ø´Ù°í »ý°¢Çß´Ù) 3. He was not certain whether he should obey her. (±×´Â ±×³àÀÇ ¸»¿¡ µû¶óµµ ÁÁÀºÁö ¾î¶²Áö ¸Á¼³ÀÌ°í ÀÖ¾ú´Ù) 4. feel certain (È®½ÇÇÏ´Ù°í »ý°¢ÇÏ´Ù) 5. They are certain to need help. (±×µé¿¡°Ô´Â ¿øÁ¶°¡ ²À ÇÊ¿äÇÏ´Ù)