the collar of the dog
the dog's collar
kittens'
plural possessive
We've done it already.
We have
Bingo is Lucas's puppy.
possessive
the child of the couple
the couple's child
the Joneses
plural
That's crazy!
That is
Lucas's coming with us.
Contraction: Lucas is
the children of the women
the women's children
students'
plural possessive
They'd planned to be there.
They had
The Smiths' address is on the envelope.
Possessive.
the parents of James
James's parents
(some people do James' parents, but a singular noun should always take <'s>)
Lucas's
singular possessive
They'd be delighted to come.
They would
That's been a problem for a long time.
Contraction: That has
the address of the Jameses
the Jameses' address
cactus
singular
He bounded o'er the mountains for to see his love.
over
She wants to keep up with James's business.
Possessive