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The house was built in 1919, since when it has changed owners several times. The house was built in 1919, since which time it has changed owners several times. 2. 关系代词which可以指代事物却 …
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2）since + 时间点才是规范用法，所以 since I was ill 也是不规范用法——因为很难说 I was ill 是一个瞬间的时间点还是一种持续的状态。 其次，题主对于这句话的困惑可以用下面两个图来示意。 第一 …
Since的时态 Since通常与完成时态结合使用，表示从过去某一时间点开始，一直延续到另一个时间点: 1. 现在完成时（have/has + 过去分词）: - 用于表达从过去某个时间点开始，持续到现在的动作或状态 …
for和since虽然也是连词，其中for是并列连词，since是 从属连词，但它们都不能用于表语从句，它就是没这个用法。语法里有些事追根究底有原因有逻辑，有些事则没有，不必要追根究底，你只要记住会 …
28 thg 3, 2019 · Look, 'since when' has this special meaning as explained here, for instance: since when? | meaning of since when? in Longman Dictionary of Contemporary English | LDOCE After …
29 thg 11, 2011 · Since 2010，这种情况指的是，2010年是一个过去的时间，现在可能是2016或2020年，我们之前就开始了，并且现在持续在做，举例： Since 2015, we have been making all students …
看看这个句子： It's been six years since we last saw each other. 我们6年没见面了。 句型分析：这是现在完成时的一种特殊表现形式，其中 since后用一般过去时态，根据动词的特点，意思有二： 1 、 …
常用的时间介词：for, since, from和ago用法及区别 1、for for用来表示某动作或情况持续了多长时间，既可以指过去，也可以指现在和将来。 I once studied the guitar for three years．我曾经学过3 …
Since在绝大多数情况下都跟完成时，不过在在这个句型中除外 it is (has been ) + 段时间 + 动作，比如： It has been five years since I got married. It is five years since I got married. 均可。 在中考中， …
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