大学英语精读5,4A句子结构问题Since parents today are having fewer children their chances of having "a child to be proud of “are lower than when families were large.since这里是because的意思么?句子为什么用when不用that?比较

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大学英语精读5,4A句子结构问题
Since parents today are having fewer children their chances of having "a child to be proud of “are lower than when families were large.since这里是because的意思么?句子为什么用when不用that?比较的不是chances么.

你的句子有问题
Since parents today are having fewer children,their chances of having "a child to be proud of"are lower than when families were large.
这个才是原句.
句子简化:since.,chances are lower.
1.since这里是表示“自从什么时候”理解成because也可以
2.when是万能的 这里的when是在than之后,引导表语从句
至于为什么不用that that在表语从句中是没有实义的
而这里的when是“曾几何时”有实际意义的
全句意思是:自从(因为)父母的孩子越来越少,他们拥有天骄之子的机会 比旧时大家族时期少的多了