·I won`t leave until my father comes back中为什么要用won`t这个将来时

·I won`t leave until my father comes back中为什么要用won`t这个将来时 I won't leave here until my mother comes back,comes为什么要用一般现在 He won't leave until his father comes.中come 为什么加s I won't leave here until my mother comes back.这是一个状语从句吧,主句和从 comes,home,I,go,he,back,until,won't my brother won't go to bed until mymother comes back.won't为什 i won't go to bed until my mother （）（come）back 为什么填comes 不说比 I won't come back until I ginish my homework. I won't go to bed ( )my mother comes back . I won't leave until you come I won't leave until I __ my homework.为什么是finish, I won’t leave ( ) you come back.