主将从现的结构是什么 ? 例句有什么?答:表示时间的:when,untill,as soon as,before,after,by the time,next time;表示条件的:if,unless,as/so long as;in case,only if,suppose/supposing that...;providing/provided that...;表示让步的:even if/though;whatever(however,wherever...);no matter what (how,where...)whether......