I guess what they’re playing is pop music这句话怎么理解?

问题描述:

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被看成做整体所以用is是什么意思?什么叫被看成做整体?被看成整体都用is吗?或者你也可以这样想is两边的要保持一致,pop music是用单数对吧,同样道理what they are playing也要用想被采纳吗?(⊙o⊙)…