scientists have been resreaching what effect smoking has on

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scientists have been resreaching what effect smoking has on us
为什么不能用 what effects?
还有可数名词不单独出现,除非有物主代词修饰还有别的情况?

effect 在此是名词“影响,效果”的意思,不可数.what effect就是“什么影响”当然不可数,所以不能用effects.
“可数名词不单独出现,除非有物主代词修饰”这是死的语法,关键是从意义上分析,其实如果前面有别的修饰语的情况下,如“this、that、the”等,只要能让听话人知道具体是指哪一个,都可以出现.

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