as解释为"当"的时候主从句的时态有限制吗?比如说As we are approaching the summit,through the treetops we could see the valley below and the sight at that point was truly impressive.这句话的are approaching可不可以改成approac

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as解释为"当"的时候主从句的时态有限制吗?比如说As we are approaching the summit,through the treetops we could see the valley below and the sight at that point was truly impressive.这句话的are approaching可不可以改成approac
as解释为"当"的时候主从句的时态有限制吗?
比如说
As we are approaching the summit,through the treetops we could see the valley below and the sight at that point was truly impressive.这句话的are approaching可不可以改成approaches

as解释为"当"的时候主从句的时态有限制吗?比如说As we are approaching the summit,through the treetops we could see the valley below and the sight at that point was truly impressive.这句话的are approaching可不可以改成approac
一般没有限制,唯一的限制来自语境的需求,
比如
As we are approaching the summit,through the treetops we can see the valley below and ...
As we were approaching the summit,through the treetops we could see the valley below and ...
As we approached the summit,through the treetops we could see the valley below and ...
语法上都对,
第一句现在时态通常用于现场报道,但主宾时态要一致：are approaching ...can see
第二、第三句用于叙述情景.
不可用 approaches ,这是第三人单数,只有前面是 he/she 时可用：
As he approaches ...he can see ...

as解释为当的时候主从句的时态有限制吗?比如说As we are approaching the summit,through the treetops we could see the valley below and the sight at that point was truly impressive.这句话的are approaching可不可以改成approac as soon as 作“一.就”解时,主从句的时态是如何搭配的? until的用法,主从句时态是什么 主从句的时态1.“If ”、as soon as、when、while‘的主句和从句的时态分别怎么决定? 当As翻译为当.时,要怎样造句?有时态限制吗? while的主从句一般都用什么时态 主从句时态什么情况是要一致的 while衔接的主从句一定要是进行时态吗? 当like和as都解释为“就像”的时候,有什么区别… if的用法是什么,当解释为是否的时候用什么时态呢 方老师您好 请问有by the time这一短语的句子 主从句的时态是什么 if whether表示是否时主从句有没有什么主将从现之类的关系?或是时态的 英语从句时态状语从句中 经常分不清主从句的时态,也就是如何正确地运用主从句的时态,以及主从句中延续非延续的动词 as 引导时间状语从句表示一……就……的句型,有关这个句型主从句的时态是怎样的? when和while的句子主从句的时态怎么看的 问一下the moment 的用法（特别是主从句的时态）RT 问一下英语各种从句中主从句前后时态要注意什么?比如说it is said that 后面为什么不能用had?具体来说主从之间的时态还要注意些什么?主从前后时态具体有哪些情况（分别说明）^_^ 时间状语从句 主从句的时态应该遵循什么规律?