unless he to help us,we shall lose the game

问题描述:

unless he to help us,we shall lose the game
为什么是填promises 而不是虚拟语气用过去式promised?

unless he promises to help us,we shall lose the game.
逐句用的是一般讲来时shall do,所以从句应该用一般现在时表将来.如果用promised,那shall就应该相应改为should(其实更顺的是改为would)