【GJ】評論
Can you tell me the reason?you did not turn in your assignment on time for sth.兩句合併Can you tell me the reason for which you did not turn in your assignment on time?for which=whyCan you tell me the reason why you did not turn in your assignment on time?可以告訴我為何你沒準時交作業嗎?表理由的關係副詞