until与before的具体区别,急答:1,主句为否定时,谓语动词为终止性动词。常见的动词有open, start, leave, go, arrive, finish, begin, stop, etc.For example:1), The noise of the street didn’t stop before/until it was midnight.2), The children won’t come back until/before it is dark.3), I didn’t leave...