Used in indirect questions to introduce one alternative.
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1. I am doubtful whether it is true. (»ç½ÇÀÎÁö ¾Æ´ÑÁö Àǹ®ÀÌ ÀÖ´Ù) 2. I don't know whether he is at home or at the office. (±×°¡ Áý¿¡ ÀÖ´ÂÁö »ç¹«½Ç¿¡ ÀÖ´ÂÁö ¸ð¸¥´Ù) 3. He asked whether he could help. (±×´Â ÀÚ½ÅÀÌ µµ¿ï ¼ö ÀÖ³ª¸¦ ¹°¾ú´Ù) 4. I doubt whether we can do anything now. (¿ì¸®°¡ ¹«¾ùÀ» ÇÒ ¼ö ÀÖÀ»Áö Àǹ®ÀÌ´Ù) 5. Whether or not he comes, the result will be the same. (±×°¡ ¿Àµç ¾È ¿Àµç °á°ú´Â °°À» °ÍÀÌ´Ù)