It was so old that he can't work.为什么was要用过去时啊?

It was so old that he can't work.为什么was要用过去时啊? 我想问问 是 so young was he that he can't do it 还是so young he was He was so tired that he couldn't go on with his work.用too... so i didn't ask who it was,为什么不用Who that was !为什么要用who it wa it was because he was ill that he didn't come 为什么要用that而不用wh His mother was so old that she couldn't go to work.(改为同义句) 英语 非谓语动词 急1．The old man is so old that he can’t work.The old The man is so old that he can't do the work It was _____ he was so young that he c He said that it was so,he was mistaken h() 英语 过去将来时用连词将两句话合并1.she was old. She couldn’t go to work(so,t The box was so heavy that I couldn't lift it .中为什么用couldn't