Helen's clothes and Mary's clothes.
Mary's is the singular possessive form.
The possessive form of the proper noun Mary is Mary's.Example: Mary's lamb was named Tinkerbell.
Helen Mary Wilson was born in 1869.
Helen Mary was born on 1977-03-14.
Mary Helen McPhillips was born in 1931.
Mary Helen Phelan is 5' 4".
Helen Mary Jones was born on 1960-06-29.
Mary Helen McPhillips died on 1998-12-16.
To change a possessive to a longer form, you can include the possessive pronoun (such as "his," "hers," "its," "theirs," etc.) followed by the noun it is possessing, instead of using the shortened form (e.g., "her book" instead of "her's book"). This makes the possession relationship more explicit and easier to understand in writing.
Mary Mackillops full name is Mary Helen Mackillop!!!
Helen McArthur's birth name is Helen Jane McArthur.
The singular possessive form is Mary's.Example: We're planning a party for Mary's birthday.