~ใด/๋๊ฐ ์ถ๋ค
~ใด/๋๊ฐ ์ถ๋ค is used to express a supposition ("I think it might...", "It seems like...", "I wonder if..."). It uses the ~ใด/๋๊ฐ form to indicate that it's a self-directed question. It can be used interchangeably with ~(์ผ)ใน๊น ์ถ๋ค, (์ผ)ใน ๋ฏ ์ถ๋ค.
์ฌํ ๋ณ์ธ๊ฐ ์ถ์ด์ ๋ณ์์ ๊ฐ๋ค. I went to the hospital because I thought it might be a serious illness.
๋ํํ ๋ฌด์จ ์ผ์ด๋ผ๋ ์๋๊ฐ ์ถ์ด์ ๊ฑฑ์ ๋ผ ์ ํํ์ด. I called because I wondered if something had happened to you so I was worried.









