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since 可以理解为“当…的时候”不？主句为什么用现在完成时 有什么依据？They have added many words to the language since it was published.
网校学员二译南**在学习低起点直达CATTI二级（笔译+口译）【周年庆专享班】时提出了此问题，已有2人帮助了TA。
网校助教
lovingenglish1
同学你好，该知识点来自沪江网校《低起点直达CATTI二级（笔译+口译）【周年庆专享班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。
同学你好现在完成时的基本用法表示过去已经开始，持续到现在的动作或状态。该用法常和表示过去某一时刻延续到现在的一段时间的状语连用。
这里的主句用了现在完成时，主要是因为since +从句(从句用一般过去时)连用，表示自某事发生后就一直…。
举个例子
The Greens have lived in Beijng since they came to China. 格林一家自从来到中国后就一直住在北京。
祝学习愉快哦
网校学员
二译南**
It's been years since I enjoyed myself so much as last night.怎 样翻？“我已经很多年没有像昨晚那么痛快了”为什么会有否定？从句表示的时间具体（从哪开始）指什么？
版权申明：知识和讨论来自课程：《低起点直达CATTI二级（笔译+口译）【周年庆专享班】》的学员和老师，如果想了解更多，可以报名参加课程学习。所有知识讨论内容，版权归作者及沪江网校所有。
低起点直达CATTI二级（笔译+口译）【周年庆专享班】
已有1人在本课程中发现了73个知识
已有56个知识得到了老师的回复
本课程热门知识点
- since 可以理解为“当…的时候”不？主句为什么用现在完成时 有什么依据？They have added many words to the language since it was published.
- 句子结构成分（求教逗号之前是什么样的存在？）：A man who fees no resentment at being cold-shouldered by others，is he not a gentleman?
- 单句改错:Henry would rather his girlfriend works in the same department as he does.
- Giving your children or encouraging them to suggest a regular chore can be rewarded with some pocket money.
- Tom raised his right hand as if ____ (say) something.
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小话题写作：
为了强身健体，我们经常组织各种各样的活动，例如：打篮球、乒乓球。
_____________ ， we often hold all kinds of activities, such as playing basketball and table tennis. - It’s not about where you’ve been, but about where you’re seen to have been.
- Devoted fans ____ (gather) at the stadium to watch the performance before we arrived.我填的had gathered，答案是gathered，是不是答案错了?
- Not having accepted the invitation to the party, little Tom ____ (weep) yesterday.
- Listening to music at home is one thing, going to hear it ____(perform) live is quite another.这个句子是不是不符合逻辑?