1、when指時間,其先行詞表示時間,在句中作時間狀語。如:This was the time when he arrived.
2、where指地點,其先行詞表示地點,在句中作地點狀語。如: This is place where he works.
3、why 指原因,其先行詞是原因,起原因狀語作用。如: Nobody knows the reason why he is often late for school.
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