turn in : phrasal verb . a.(to go to your bed in order to sleep)上床睡覺 ex: He is turning in now = He is going to bed now or He is going to hit the bed now.
b.(turn in obj, turn obj in =GIVE) 繳交某物or投案(turn sb in)
ex 1: You had better turn in the paper by tomorrow 10, or else Professor London will fail you.你最好明天早上十點鐘以前就把報告給交上去,不然蘭登教授一定會當你
ex 2:He had better turn himself in, otherwise he will get you killed.
2008-05-15 11:50:28 補充：
P.S. 你的問題的翻譯就是 : 他會遲交作業這件事實在是很不尋常(很怪).他每次都很準時啊(交報告or作業)
Assignment n. a piece of work given to someone, typically as part of their studies or job:泛指一份指派給某人的作業,通常都是他們的專題研究或者是他們的工作的一部份
a freelance/photo assignment 題目自由選擇的報告&圖文報告