I guess what they’re playing is pop music这句话怎么理解?what they’re playing is pop music是宾语从句吗?还是主语从句?谓语动词为什么用is?

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I guess what they’re playing is pop music这句话怎么理解?
what they’re playing is pop music是宾语从句吗?还是主语从句?谓语动词为什么用is?

guess是谓语动词,谓语动词后接宾语从句,另外该宾语从句单独来看是由what引导的主语从句,what they are playing 是主语成分看做整体所以用is

what they’re playing is pop music是that引导的宾语从句,作guess的宾语,that省略
what they’re playing又是一个主语从句,是What引导的主语从句,在上述宾语从句中作主语,is的主语就是整个主语从句而不是they 或者I,所以用is那what引导的主语从句的结构是什么?
另外,是不是从句是主语,谓语动词就用单数?what...

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what they’re playing is pop music是that引导的宾语从句,作guess的宾语,that省略
what they’re playing又是一个主语从句,是What引导的主语从句,在上述宾语从句中作主语,is的主语就是整个主语从句而不是they 或者I,所以用is

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