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
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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

no people,except Mike and John,always ()...这里的动词是用单数还是复数?为什么? children作主语时动词用单数还是复数这个词作主语时,后面的动词是用单数还是复数啊?急,例如the children ( ) running in the street now.这里是用is 还是用are?为什么会这样啊？ far more than one这样的主语,谓语动词是用单数还是复数? none做主语是谓语动词用单数还是复数? 主语是much money谓语动词用单数还是复数 主语是shoes,谓语动词用单数,还是复数 to some children 做主语 后面的谓语动词用是单数还是复数?就是动词的形式 主语是when and where,谓语动词用单数还是复数?为什么? 主语是不可数名词时,谓语动词用单数还是复数?（这里的谓语动词不是Be动词!是像do等……词）单三还是普通？ 主语从句主句的谓语动词用单数还是复数 WHO 做主语一般现在时的动词用单数还是复数? 主语是第三人称单数,故谓语动词要用第三人称单数he feel well 这里的feel 如果前面是they的话 是不是用feels?如果feel 没有复数 那举个例句看看 five -year- olds像这样的泛指做主语谓语动词用单数还是复数?哎,到底是复数还是单数啊,纠结中 none 前面的be动词是单数还是复数为什么 family的单数形式作主语,谓语动词为什么用了复数形式呢? family的单数形式作主语,谓语动词为什么用了复数形式呢? goods的用法,帮忙现在用这个词什么意思啊,用做主语的话,谓语动词是单数还是复数啊 为什么each做主语 谓语动词用复数 而 each.and each.谓语动词用单数是固定用法吗