状语从句But each year,the dogs are still sent out into the snow

来源：学生作业帮编辑：神马作文网作业帮分类：英语作业时间：2024/11/20 05:22:45

状语从句
But each year,the dogs are still sent out into the snow whenever a traveler is in difficulty.这里的whenever引导的是什么从句?whenever什么时候可以引导这种从句?whenever的用法?

这个问题有代表性.
这是个高考难点和重点.
知识类别：
疑问词+-ever
划分：
疑问代词+-ever:whatever/whichever/whoever(whomever)
疑问副词+-ever:wherever/whenever/however
含义：“无论；不管”
作用：
疑问代词+-ever:whatever/whichever/whoever(whomever)
引导名词性从句、让步状语从句
疑问副词+-ever:wherever/whenever/however
引导让步状语从句,可以替换为 no matter+疑问副词
结合例句看用法：

whenever引导的两类状语从句

       引导让步状语从句
       引导让步状语从句,表示“无论何时”,相当于 at whatever time,no matter when等.如：
Whenever I see him,he's reading.我无论什么时候看到他,他都在看书.
Whenever I go to London I try to see Vieky.我什么时候去伦敦,都设法去看看维基.
Whenever you come,you are welcome.你什么时候来,我们都欢迎.

       引导时间状语从句
       引导时间状语从句,表示“每当”“一……就”,与when用法相似,但语气更强.如：
The roof leaks whenever it rains.这屋顶一下雨就漏.
I go to the theatre whenever I get the chance.一有机会我就去看戏.
Whenever I mention playing football,he says he's too busy.我一跟他提踢足球的事,他就说太忙.
      从句主语和谓语有时可以有所省略.如：
Whenever (it is) possible,he goes to see her.只要有可能,他就去看她.
Robbie had arranged for this man to come whenever needed.罗比安排好,随时需要这人就可以来.
祝你开心如意!
再问：您回答的太好了！感谢！那就是whenever和when在引导状语从句的时候没有本质的区别是吗？
再答：看上面的用法可知，二者有明显的区别。但是，只是在引导时间状语从句时，才比较接近，但是whenever还是多出了“【无论/不管】何时”的意思。 when=at certain time whenever=at any time

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