ever since 的结构(作为连词)=since 完成时态---- ever since +主+动词简单过去式。
ever since 作为连词。
ever since 也可作为副词，解释“此后”（就一直...）
例句
He\'s had a car ever since he was 18.
他从18岁起就有汽车了。
He\'s been there ever since you left!
自从你离开，他一直都在那儿！
He\'s borne me a grudge ever since that day.
从那一天起他便对我怀恨在心。
