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An instrument is used to measure how much of something there

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An instrument is used to measure how much of something there is.后面部分的句子结构?
就是 how much of something there is 这部分是短语吗?在句中是什么成分?
我了解到:特殊疑问句做名词性从句,直接保留特殊疑问词,后面的句子变成陈述句语序;
对于“ of something there is” 这个陈述语序如何分析句子成分?
An instrument is used to measure how much of something there
how much of something there is 是宾语从句,修饰measure的,how much of something there is,
陈述语气应该是there is something of how much,举例,there is a bed of 1.5 metres ,1.5米长的床.