关于英语学习,我发现了一个很重要的问题,在我记忆里,动词加s是表示复数的,但我现在做题都发现加s却是表示单数,举个例子Sheistheonlyoneofthewritersherewho(write)storiesforchildren.o

Question

关于英语学习,我发现了一个很重要的问题,
在我记忆里,动词加s是表示复数的,但我现在做题都发现加s却是表示单数,举个例子
She is the only one of the writers here who              (write) stories for children.
only所以要用单数形式,于是填writes（这时我就懵了）
   2.Though not so popular as before ,the custom is still kept by people in many places,who          (regard) it as a necessity to marry procedure
答案说先行词是people,要填复数形式,是regard（这里我又懵了,为什么有不加s啊）

Answer 1

she是单数第三人称,write在这里是动词“写”,单数第三人称其谓语动词要加s.
同理,由于people是复数的,所以谓语动词regard就不用加s了