when是连词还是副词啊？ 如何区分英语中when之类的词是作副词还是作连词用的？
when\u662f\u8fde\u8bcd\u8fd8\u662f\u526f\u8bcdwhen
\u526f\u8bcd. \u4ec0\u4e48\u65f6\u5019\uff0c\u4f55\u65f6\uff0c\u5f53\u65f6\uff0c\u4ec0\u4e48\u60c5\u51b5\u4e0b
\u4ee3\u8bcd. \u4ec0\u4e48\u65f6\u5019\uff0c\u4f55\u65f6
\u8fde\u8bcd. \u65e2\u7136\uff0c\u867d\u7136\uff0c\u53ef\u662f\uff0c\u5728\u2026\u65f6\u5019
1. \u4f5c\u4e3a\u7591\u95ee\u526f\u8bcd,\u5f15\u5bfc\u7279\u6b8a\u7591\u95ee\u53e5,\u610f\u4e3a\u201c\u4ec0\u4e48\u65f6\u5019\uff1b\u4f55\u65f6\u201d.
2. \u4f5c\u8fde\u63a5\u526f\u8bcd,\u5f15\u5bfc\u540d\u8bcd\u6027\u4ece\u53e5\u6216\u4e0d\u5b9a\u5f0f,\u610f\u4e3a\u201c\u4ec0\u4e48\u65f6\u5019\u201d.\u4ece\u53e5\u4f7f\u7528\u9648\u8ff0\u53e5\u8bed\u5e8f,\u65f6\u6001\u6839\u636e\u5b9e\u9645\u60c5\u51b5\u800c\u5b9a
(用作疑问副词)什么时候,何时
I'd like to know when they'll let him out.
我想知道他们什么时候放他。
(用作关系副词,引导关系从句)当...时
There were times when I didn't know what to do.
有些时候我不知道该怎么办才好。
做连词 conj
1.当...时
Tom got engaged to her when travelling last winter.
去年冬天旅行时,约翰与她订了婚。
有时还可以做代词（不过不常见）
代词 pron.
1.什么时候,那时
Since when has she taught here?
她从什么时候开始在这儿教书的?
引导表语从句的连接副词有when，where，how，why。它们除起连接作用外，还在从句中分别作时间、地点、方式和原因状语，各有词意。其结构为 “主语+系动词+when／where／how／why”。例如：
My shongest impression is when I attended an American wedding．(when作时间状语)我最深的印象是参加一次美国婚礼的情景。
That is where we don't agree with you．(when作地点状语) 那正是我们不同意你的地方。
同位语从句
用作同位语的从句，叫同位语从句。它一般用在某些名词如idea，news，fact，promise，suggestion，belief，truth等后面，用以说明该名词所表示的内容。
1．引导同位语从句的连词有that连接副词有how，when，where等。例如：
We heard the news that our team had won．我们听到了消息，我们队已经赢了。
I have no idea when she will be back．我不知道她什么时候回来。
You have no idea how worried I was!你不知道我当时有多么焦急!
引导主语从句的连接副词有when，where，how，why等，它们在从句中分别作时间、地点、方式或原因状语。例如：
When they will start has not been decided yet．他们将何时出发还没决定。
There she has gone is not known yet. 她去了什么地方还不知道。
How he became a great scientist is known to all．大家都知道他是怎样成为著名的科学家的。
Why he did it wasn't quite clear. 十分不清楚他为什么这么做。
how，why。它们除起连接作用外，还在从句中分别作时间、地点、方式和原因状语，各有词意。其结构为 “主语+系动词+when／where／how／why”。例如：
引导定语从句的时候是关系副词，作为时间状语
引导宾语从句的时候是连接代词
when在字典中的解释：
when
[(h)wen]
conj.
就在那个时候, 在...的时候
adv.
什么时候, ...的时候
pron.
什么时侯, 那时
所以，当做连词还是副词要看语境。
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