As children mature ,they develope (an independence) that their parents ,who have been responsible for them since they we
问题描述：
As children mature ,they develope (an independence) that their parents ,who have been responsible for them since they were born,often find difficult to accept.
括号部分为什么是对的呢
按理说 用的都是children 和they 应该用复数啊 ...
答
我不知道你们有没有学过定语从句.
你要知道一个句子是由各个部分组成的.
THEY主语
DEVELOPE谓语
AN independence宾语
that their parents often find difficult to accept.是修饰independence的定语从句,它是定语.
who have been responsible for them since they were born这个是用来修饰their parents 的定语.这里做题可以忽略它.
句意是,随着孩子的成熟,他们发展了（家长难以接受的）经济独立要求.
我的翻译省略了家长的修饰语,它无关紧要.
你可以看到an independence是作为经济独立要求解释,与CHILDREN和THEY完全没有关系,举个例子.
你们这些孩子制造了一个大麻烦.
你看：孩子,你们都是复数,但是麻烦用复数了吗?没有!为什么呢?你肯定会说,这没关系嘛!
对了,就是没关系.
they develope (an independence) ,孩子们建立的一种独立的思想,许多孩子为什么一定要建立许多思想,一个就可以了.宾语和主语无关,你要注意了.