's - Apostrophe
Mandy brother John plays football.
My teacher name is Alex Liang.
Plural:Add the apostrophe to regular plural forms:
The girlsroom is very nice.
The Smithscar is black.
Add to irregular plural forms:
The children books are over there.
Men clothes are on the third floor.
If there are multiple nouns, add an only to the last noun:
mother is a teacher.