Do you know the reason-----he was late for school.

Do you know the reason-----he was late for school. 】Do you know the reason ____ he was late? Do you know ________ he was late for school today? Do you know the r_____ why he was late for school? Do you know the r____ why he was late for school? this is the reason 【why】he was late for school? this is the the reason why he was late for school is still unknown to us Do you konw the reason ___he came late for school?Yes,The re I dont know why he was late for school again. 之前的那个句子写错了,不好意思哈!应该是：“The reason why he was late for school The reason why he was late was his always being late for sch Do you know the reason why/for which he didn't come?这句话的意思?