What is the difference between regular plurals and irregular plurals ? What is the pronunciation of " girls' " ?

how many plurals and exception if u know tell me some!!!!!!!!!!!!!!!!!

I have come across the following plurals being used. Are they correct? If they are, then how are they to be used appropriately? childrens hairs

What are the proper plurals for more than one Santa and Mrs Claus? Example: There were several Santas and Mrs. Claus around the house.

How do you pluralize proper names - add an s or 's?

I think these two sentences are correct "she had gone to buy fruits." "the mother feeds the poors" but it was given that the plural used here is wrong here;in fact, it was written that these words always exist in singular form.

I want to write Cypress Trees plural by removing the word Trees and just state Cypress.....how to I plural Cypress?

How do you make "Last Will and Testament" plural? How about "Power of Attorney". As you can probably tell I work for an attorney and I don't want to sound ignorant when writing letters to people including more than one document. Any help would be greatly appriciated.

1. How do you pronounce friends' friend? Do you pronounce them as /friends friend/ or /friendsis friend/. I heard people pronounce it as /friends friend/ . Shouldn't it be pronounced as /friendsis friend/ in the plural form? What about girls' school? /girls school/? If you pronounce it in the singular...

Confused by the following statement; Ballistic Plates Inserts. Is it the plural for Ballistic Plate Insert?