which
🇺🇸
/wɪtʃ/
🇬🇧
/wɪtʃ/
asks about one thing from a group
Which book do you want to read, which is on the shelf?
어떤 책을 읽고 싶으세요, 어떤 책이 책장에 있나요?
shows the exact thing you mean
She found the key which opens the door.
그녀는 문을 여는 열쇠를 찾았습니다.
adds more details about something
The car, which is red, is very fast.
그 차는 빨간색이며 매우 빠릅니다.