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问题 求解分析下面几组句子，请给出一个合理的时态解释。

...sp;had done + since: since前面的句子可以采用过去完成时态had done：Since the party she had only spoken to him once.（那次派对之后，她只和他说过一次话。）B. was + since + had done:since后边的从句也可以用过...

问题 It...since...主从句时态问题，以及since从句可否使用“否定式”？

...否改为It is a while since we were not out  ?  就是主从句时态改变一下，和原句意思一样吗？

问题 关于since从句的时态问题

I have had these impulses since I can remember.1.为何since从句不用since I have been able to remember?2. 如果从句用since I have been able to remember，和原句相比，二者在句意上有何细微差异？期待各位老师的帮助，十分感谢。

问题 since时态问题

I have lived here for several years now and I've made many new friends since I have lived here.请问，为什么since部分用现在完成时，而不是用过去时呢？ “自从我住在这里” 这动作不是发生在过去吗？

问题 since做连词引导句子的时态问题

...nce引导状语从句是现在完成时的话，主句一般可以有什么时态？2、上句的So much做主语是属于什么情况？感谢老师回答

问题 since主句的时态

...是不是应该用过去完成时（后句allowed)？但却用了一般过时态。再如有一个句子是：It was the worst flood since records began.这是有记录以来最严重的水灾。（牛津）

问题 since主句时态

...现在完成时对吗？老师能否给总结下主句从句都能用哪些时态？

问题 现在完成时态+since we were at college，since从什么时间算起？

We have known each other since I was at college.We have known each other since we were at college.请问这两句话since从句的起算时间一样吗？从什么时候算起？

问题 这个since的主句为什么不用完成时态？

当since表示“自从”时，它的主句谓语总是要用完成时态的，但是下面这句中，主句却用了现在进行时，请问这是为什么？House prices are rising for the first time since November. 房价自 11 月以来首次上涨。

问题 since从句不同时态产生的语义差别辨析？

关于-ing分词分句与限定从属分句的转换关系（章振邦新编高级英语语法543页。）Since being in the army, he has been in much better health.=Since he was=Since he has been请教老师，以上果真是相同的意思吗？我在薄冰英语惯用法词典945页看到：since...

问题 since后面能跟瞬间动词的完成时态吗？

比如 it has been 10 years since they (have) left. It is 3 years since they have seen/saw each other.

问题 It is...since...的主句与从句时态

It was three years since Jack had been a teacher.It is three years since Jack was a teacher.请问这两句有什么区别吗？分别是什么意思？第二句为什么不用has been呢？

问题 时态问题(涉及since的主句用现在进行时)

You are looking much younger since I saw you two years ago. 这句中 are looking 是不是应该改为 have looked 才正确，我记得从句用 since, 主句用完成时，对吗？

问题 since 从句be动词的时态理解含义

老师您好！1）The surface feature has remained in popular culture since the image of the "Face on Mars" was known.可否说成...since the image of the "Face on Mars" "has been" known 用现在完成时呢？2）语法书上说She has never written to me since I was at this school. 自从我“...

问题 since主句的时态

DeepSeek is a technology company that has suddenly become well-known recently. Since it started, the company _________(create) many new products that make our lives easier.请问各位老师这是一道初中语篇填空的题，答案是has created，请问在这里有没有填create的其它形...