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
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

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