请问,Mrs.white became a teacher in 1985.she ____for twenty years by next summer.
mrs.white became a teacher in 1985.she ____for twenty years by next summer.
答案是will have been teaching 我查到这种语法叫将来完成进行时,请问是不是”在很久以来一直在进行这样一个动作,并且将来将继续这个动作“,就用这个时态呢?