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关于英文when的词性

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关于英文when的词性
在我的词典中when有三种词性,adv,conj,pron.
但是我的词典中所给的例句比较混乱.
请问,when作为这三种词性的区别?
或者说,在一句话中,如何分辨when是副词,是连词,还是代词?
请给出例句.
关于英文when的词性
1、[adv.]
(1)[疑问副词]什么时候,何时,在什么情况下;
用于疑问句首,如 When do you begin your classes?
(2)从前,以前;当年:When you were a child,you didn't know what it means.
(3)在……时候:His wife always complains when he smoke.
(4)[关系副词]彼时,其时:Where when he knows wrong,he doesn't admit.
2、[conj.](常用于连接两件事)
(1)什么时候:He told us when to eat.
(2)届时,在那时:He came at six,when the sun was setting.
(3) 是……的时候了:He came at a time when we needed help.
(4)当……时,在……的时候:When we are at college.
(5)每逢,每当:She smiles when you praise her.
(6)相反,而,却:To complain of one's lot when one might change it.(本来可以改变自己的命运,却自怨命苦.)
(7)既然,鉴于:How can he help when they won't let him.
3、[pron.]
什么时候(常用于定语从句):It was in the morning,when he died.
4、[n.]
时间:When in doubt,leave out. 再问: (1)He came at six, when the sun was setting. He came at a time when we needed help. 这两句可不可以理解为when引导的从句修饰的是six和a time。这是什么类型的从句? (2)His wife always complains when he smoke. He came at a time when we needed help. She smiles when you praise her. 这不都是状语从句么?您能不能详细说明一下。 (3)He came at six, when the sun was setting. when前面加逗号是什么从句?
再答: (1)第一个是定语从句,用关系副词When引导;第二个是状语从句,不是定语从句。 (2)都是状语从句,第一句:His wife always complains 主谓都有了,when he smokes 充当时间状语,表示妻子抱怨的时间。 第二句:状语从句when we needed help表示他回来(出现)的时间。 第三句:状语从句when you praise her充当时间状语,表示她微笑的时间。 (3)when前面加逗号则是定语从句中的非限制性定语从句。