【原】比较：during which，during which time和when - 白话英语语法3

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both与all的词性怎样判定 - 白话英语语法2

前段时间，群里有朋友问：

during which 和during which time有什么区别？题目是这样的：

They stayed with me for two weeks, ____ they drank all the beer I had.

          A.for which                B.which time

C.during which time    D.during which

答案选 C。这道题可以选D或用when来代替吗？

对此，我解释说：

during which time是用来引导定语从句，专门修饰纯粹的时间段。什么叫“纯粹的时间段”呢？就是以长短来计的时间，比如这一题里的two weeks，再比如three years，half a month等。这样的时间不包含任何活动，所以用in which time强调其纯粹的时间性。

during which则不同，一般来说即便是时间段，也算成整体，或者就是与某项活动相关联，比如the American Civil War, during which... the summer hilidays during which，如此等等。

至于说when，其实相当于on / at / in which，其他介词构成的时间状语一般来说是不用when替代的。

同理，where作为定语从句引导词的时候，也是代替on / in / at which，其他介词构成的短语一般是不用where替代的。

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为了这个问题，我还去网上特别搜索了一下，在一些英语语法讨论网站上，就有人给出这样一个clue：

one of them refers to a period of time, the other to an event.

即，during which time和during which这两个说法，一个指的是一段时间，一个指的是事件，还是有区别的。

至于说哪个指的是事件，哪个指的是时间，——这还用问吗？

原网站就是这么回答的。。

在另一个网站（ell.stackexchange.com）上，有人这样解释，我觉得蛮好的：

You use during which when you refer to something, an event, that was happening, while at the same time something else happened:

We had a great lunch, during which my father gave a speech.

You use during which time to indicate that something happened in the time-span that is taken by something else.

She spend hours doing her make-up, during which time I managed to finish reading "War and Peace".

The main difference between the two phrases is the implication that my father gave a speech at the mentioned dinner - he was present there, and the speech was given in the presence of the diners. If I would have said during which time my father gave a speech, he could have been anywhere else, giving a speech, but not to the people at the dinner!

In the second sentence, I have been reading my book, but that was not something that was part of her doing her make-up, I probably wasn't even present.

To show this contrast with two similar phrases:

The class lasted two hours, during which we read Hamlet.
The class lasted two hours, during which time we read Hamlet.

The fist sentence means that this was probably a literature class, and reading the play was part of that class - everyone read the play together. During which refers to the class.

The second sentence gives the impression that the class was possibly boring, or "we" were not even present, but instead of paying attention to the class, we read the play. During which timerefers to the two hours, the time that the class lasted.

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关于这个问题，我在百度文库里还找到一篇能免费查看的文章，我把链接放在本文左下角的“阅读原文”上，朋友们点击即可跳转。

原创不易，请大家随手帮转。感谢你们！