这里的主语是复数,为什么系动词用的是单数形式?Snakes did not acquire their poison for use against man but for use against prey such as rats and mice,and the effects on these of viperine poison is almost immediate.这是新概念英

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这里的主语是复数,为什么系动词用的是单数形式?Snakes did not acquire their poison for use against man but for use against prey such as rats and mice,and the effects on these of viperine poison is almost immediate.这是新概念英

这里的主语是复数,为什么系动词用的是单数形式?Snakes did not acquire their poison for use against man but for use against prey such as rats and mice,and the effects on these of viperine poison is almost immediate.这是新概念英
这里的主语是复数,为什么系动词用的是单数形式?
Snakes did not acquire their poison for use against man but for use against prey such as rats and mice,and the effects on these of viperine poison is almost immediate.
这是新概念英语第四册中一篇关于蛇毒的文章中的一句话.
请问,第二句中的主语感觉就是the effects,这明明是个复数名词,为什么后面的系动词用的是is 而不是are?请指教.

这里的主语是复数,为什么系动词用的是单数形式?Snakes did not acquire their poison for use against man but for use against prey such as rats and mice,and the effects on these of viperine poison is almost immediate.这是新概念英
effects虽然有s 但不是复数形式 他的意思是结果

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