We add 's to a noun (or just ‘ after a plural noun or word that ends in "s") to indicate the POSSESSIVE form,

Question

We add 's to a noun (or just ‘ after a plural noun or word that ends in "s") to indicate the POSSESSIVE form, i.e. the noun owns or has got something. E.g. The girl's mother, James' car. Put ALL NOUNS in these phrases into the plural form using the POSSESSIVE form where appropriate.

E.g. 1. The boy's toy.
2. The child's parent.
3. The girl's school.
4. The country's leader.
5. The woman's hat.

Answer 1

1 The boys' toys
2 The children's parents
3 The girls' schools
4 The countries' leaders
5 The women's hats

Answer 2

The rule is: When the plural form of the noun does not end in "s", then it is ended with 's.

so, if you are wanting to indicate a plural form of each:
boys' toy(s).
children's parent(s)
girls' school, countries' leaders
the women's hats. You have to change the noun after to make sense.

I received your additional question, but your email has not been confirmed. Here is the additional information:

Let's see. An example I could use: When the plural form of a noun does not end in "s", such as fireman to plural form, firemen, or woman, to women, then it would be 's, firemen's truck, not fireman's truck. If you were to indicate a singular ownership (possessive) of something, such as the the fireman's pick-up truck, that is the way you would write it. Usually, you think of of firemen's red truck went speeding by... see the difference? The women's room (bathroom) vs. woman's room is her bedroom. Does that make sense? however, boys, toys, dogs, horses, all end in "s", as do last names such as Thomas' , Michaels' and should be indicated as possessives (boys' play, toys' noises, horses' manes, etc. horse's mane, is singular. I hope this clears things up.

Answer 3

- the girl's mother (one girl); the girls' mother (two girls with the same mother (sisters)); the girls' mothers (two girls with different mothers)
- James's car (a proper noun takes the 's)

1. the boy's toy; the boys' toy (or the boys' toys)
2. the child's parent; the children's parent (or the children's parents)
3. the girl's school; the girls' school (or the girls' schools)
4. the country's leader; the countries' leader (or the countries' leaders)
5. the woman's hat; the women's hat (or the women's hats)

Answer 4

1. The boys' toys.
2. The children's parents. (The childrens' parents also possible)
3. The girls' schools.
4. The countries' leaders.
5. The women's hats. (The womens' parents also possible)

Answer 5

Your premise is wrong. We add 's to a singular noun whether or not it ends in "s", plural nouns that end in "s" have only ' after them to indicate the possessive form but plural words that don't end in "s" are followed by 's.

Therefore the plural forms are as follows:

The boys' toys.
The children's parents.
The girls' schools.
The countries' leaders.
The women's hats.

Answer 6

Depends what book you read. There are several dominant styles just in the US, Chicago and New York to name a couple. In one, you add an apostrophe and then an "s" after proper nouns, in the other, you just add an apostrophe like your example.

You can find sources saying either way is correct, but I prefer to add apostrophe and "s" after proper nouns. (James's car)[I pronounce it that way too.]
boys' toy
childrens' parent
girls' school
countries' leader
women's hat

Answer 7

The boys' toys
The children's parents
The girls' schools
The countries' leaders
The women's hats

Answer 8

The boys' toys
The children's parent
the girls' school
the countries' leaders
the women's hats

Answer 9

the children's parents
my sisters' schools
the countries leaders
the women's hats

Answer 10

boys' toys
children's parent
girls' school
countries' leaders
women's hat