有过去完成时的时候when应该连从句还是主句啊？
新概念2的第14课的Key structures里的例句是：
When he had finished lunch he asked for a glass of water. （他吃完午饭后要了一杯水。）WHEN 后面接过去完成时。但是在课文里是I had nearly reached the town, when the young man suddenly said, ’Do you speak English?’ WHEN 后面接的是过去时。查自学导读上的例句也是：When I woke up in the morning, she had already had her breakfast.
但是，查语法书上说When 连接的从句时，从句动作先于主句动作或主从句动作在同一时期发生。但是新概念里说过去完成时，常常用来表示发生在过去的两个事件、动作哪一个发生在前。
要是这么说的话，课文里的句子就是快到达城镇先发生，年轻人说话后发生。但是这样的话就和语法书上的“When 连接的从句时，从句动作先于主句动作”矛盾了啊。晕啊，到底WHEN后面连的从句应该是什么时态啊？还是都可以啊？像下面这么写行么？
When I woke up in the morning, she had already had her breakfast. （我起床时，她已经吃过早饭了。）要是写成:When she had her breakfast, I woke up in the morning. （她吃过午饭后，我起床了。）对么？
这两句话的中文意思看起来一样啊。
When he had finished lunch he asked for a glass of water。 （他吃完午饭后要了一杯水。）中， when 是从属连词，当。。。时后之一。而在I had nearly reached the town, when the young man suddenly said, ’Do you speak English?’中，when是并列连词，就在这时之意。
其后常用一般过去时，表示未料到情况。又如：I was just about to sleep(,)when the phone rang。我刚要睡觉，这是电话铃响了。 When I woke up in the morning, she had already had her breakfast。
这个句子中，when是当。。。时候之意。这句强调刚吃完饭。如果改成When she had already had her breakfast, I woke up in the morning。强调醒来。
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