Question

英语新概念4里的语法问题，求各位大神帮助！！答好加分 。谢谢了

1.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. 这里为什么用depending，而不是 depends 或者 is depending 最后的 is overdrawn 里 is能不能省略
2 the question became one of whether man could control the disease he had invented. 这里 为什么用 one of 而不是 that 或者 one that

Answer 1

1.(the banker customer relationship) is (that of debtor and creditor)[that指代relationship]--
who is which
(depending on (whether the customer's account is in credit or is overdrawn)).
这里的which并没有引导一个从句，而只是代词。depending动名词短语作为which的补足语。
overdrawn前加is是为了明确表明其前面没有in，避免or并列引起的歧义。

2 the question became one of whether man could control the disease he had invented.
我认为，用that替代one of也说得通，用one that则非常不顺了。
没有上下文可供参考，只能估计。

追问

请问下那个 depending 前面加上is 说的通吗？ who is which 做主语， 加上is 当成一个主语从句

追答

who is which不是主语，而是一个子句的主体。意思是：到底是哪个（是debtor还是creditor）取决于...。如果要is就必须改为who is which that is...

追问

who is which 可以看成是前面那句的缩写， depending…… 当做从句？ 那破折号两边是否能接两个完整的句子吗？

追答

破折号前后的确是两个完整的句子。depending ...在原句中不是从句，改为that is depending ...就是从句了。比如：These fans will either blow the air down or up, depending how you set them.（吊扇可以把空气向上或者向下吹——这取决于吊扇是怎样安装的。）这里的depending不是从句，其后的how才是从句。

Answer 2

or 连接两个并列成分。之前是介词+名词。而overdrawn是个分词。。。所以把is加上，这样or两边的成分才是并列的关系。
depending　　这个我没想明白呢。

第二句话我也没咋看明白。。。。。能力有限。。

Answer 3

“depending on whether...”这个成分修饰句子“who is which”，所以必须用depending。

Answer 4

1. 破折号的后面，who is which 已经是一个主句，depending on 就是动词 -ing 形式作状语。最后的 is in credit or is overdrawn 中 is 后面的两个表语不是同一结构，in credit 是介词短语作表语，overdrawn 是过去分词作表语，所以 is 保留更好。
2. one of 是指 one question of，后面的 whether 从句其实与 one question 指代相同的含义，我认为是同位语从句。因该从句有“是否”这个含义，所以不能换成 that 来引导。

个人观点，仅供参考。