In his letter,he said he__(be)back by train in two days.过去将来时
问题描述：
In his letter,he said he__(be)back by train in two days.过去将来时
答
In his letter,he said he_would be_(be)back by train in two days.请问这适合多大的人做比如说几年级？9年级（初三）哦，谢谢