It was 7 o'clock when he came here yesterday. 是定语从句吗?

It was 7 o'clock when he came here yesterday. 是定语从句吗? when he came back from work ,it was ten o’clock.同义句 He _____ It was at two o'clock p.m.when he came back.哪里错了? 1：It was 6 o'clock -------he came home A.that B.what C.when It was noon when he came back?是什么从句? It was at 9 o'clock that he came back和It was 9 o'clock which It was 6 o’clock yesterday evening. about定语从句it was about four o'clock------ i finished writing when i finished _____ yesterday,it was 9 o'clock in the even It（）seven o'clock when I（）home yesterday. A,was,get B,is,get It was already morning when he woke up. 这是状语从句还是定语从句啊,谢谢了 It was eleven when he came back .请问when 引导什么从句,怎样译?