I have a doubt. We always use apastrophe (') after the plural noun
eg if we say of many teachers then it is teachers'
but for children it is children's and not childrens'. Why is this so?
I know this sounds very basic but I want to clear my doubt.
I suppose it's because children is plural by itself ("childrens" is obviously incorrect)
To put it in an equation (equating the count on both sides):
Child = Teacher
Hence, Child's = Teacher's
Children = Teachers
Hence, Children's = Teachers'
My GMAT debrief