since,有哪几种用法??
"since"的5种用法: 1.since+过去某时间点[指具体的年,月,日,时,星期几等] eg:he has beeb here since 1999 2.since+一段时间+ago eg:ha has been here since 5years ago 3.since+一般过去时的从句 eg:many things have changed since you left 4.it is/has been +一段时间+since+从句 eg:it is 2 years since i came here 5.it is +some time+since+从句 表示"自从...以来,已经...时间了"
标签：since,哪几种,用法
版权声明：文章由 酷百书 整理收集，来源于互联网或者用户投稿，如有侵权，请联系我们，我们会立即处理。如转载请保留本文链接：https://www.kubaishu.com/life/179262.html
