ever since 的结构：(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：We have lived in Shanghai ever since we came to China.(自从我们来到中国之后就住在上海.)
ever since是什么意思,和什么时态连用?