ever since 和since 还有since then 有什么区

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ever since 和since 还有since then 有什么区别?
它们分别用在什么时态..在句子的哪个位置?怎么用?

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  • ever since 作为连词=since 完成时态---- ever since +主+动词简单过去式 例:I have known him ever since he was a child. 他从小我就认识他了. 这种用法同since 差不多,不过 ever since 比 since 用得少. 再如:W...