2 句子结构分析
向尊敬的曹老师请教几个长难句：
1. Debtor and creditor overdraw primarily , the banker-customer relationship is that of debtor and creditor—who is which depending on whether the customer's account is in credit or is overdrawn.
Debtor and creditor overdraw primarily, the banker-customer relationship is that of debtor and creditor为啥这里的逗号连接的是两个句子？
who is which depending on whether the customer's account is in credit or is overdrawn. 这个结构该如何分析？而且还是在波折号的后面？
2. An old saying has it that half of all advertising budgets are wasted—the trouble is, no one knows which half
波折号后面的成分是对前面内容的补充说明吗？no one knows which half是表语从句，，还是应该把the trouble is 看成一种注释性的状语？
非常期待曹老师的解答！！感谢！！！
最佳答案 2022-11-28 16:46
1 这段话出自新概念第四册第12课。不知你从哪里抄的句子，你抄错了。原句如下：
Primarily, the banker-customer relationship is that of debtor and creditor—who is which depending on whether the customer's account is in credit or is overdrawn.
所以，不存在所谓逗号连接二个分句的问题。破折号在此表示说话时节奏上的较长的停顿，以此来强调后面的内容。本句中破折号后为一个独立主格结构，即现在分词depending...带有自己的逻辑主语who is which。who is which在此是一个名词性疑问分句。独立主格结构在此作状语，对前面的句子作补充说明。
2 An old saying has it that half of all advertising budgets are wasted—the trouble is, no one knows which half.
这个句子中的破折号表示突然改变话题（an abrupt change of topic）。the trouble is为插入语。剑桥语法的类似破折号用法例句为：
You may be right – but that isn’t what I came here to discuss.
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