it＋一段时间＋have done sth＋since表示什么？

如题所述

推荐答案 2013-07-19

用于句型“It’s / It has been + 一段时间 + since + 时间状语从句”中，译作“自从…以来, 已经…(时间)了”。如 It’s / has been three months since he moved to this city. 要求：主句的谓v.用一般现在时或现在完成时；从句的谓v.用一般过去时，而且须是终止性动词。应该是这个吧···

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第1个回答 2013-07-19

表示自从什么时候以后怎样怎样
= 时间+ has passed since....= 主语+助动词+过分加+ for+世间段=主语+助动词+过分加+时间点+ago
如果有什么不会望追问谢谢采纳这是现在完成时的一个固定结构之一吧初三的内容。

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have since done it has been done notice sth done have done doing 什么时候用had done cant have done have done和done not have done had already done