bob
Calf's. The calf's tail was swatting at the fly.
tooth's - as in "A tooth's root extends down into the jawbone."
his
"Their" is plural possesive, meaning this person's plus that person's joint ownership, e.g., her and his house (theirhouse).
"Has" is a verb that is paired with a singular noun or pronouns as in: Bob has,he has, she has or it has. Plural nouns would use have, such as, The people have, we have, they have, you (all) have. Of course , have is also used with the singular pronoun I , I have.
pilot's
enemy's
Actress'
The singular possessive form of city is city's
The singular possessive noun for child is child's.
Buses' is plural possesive.
Dad? Although father is already singular "My father's car" singular possesive
tooth's - as in "A tooth's root extends down into the jawbone."
Calf's. The calf's tail was swatting at the fly.
Singular: hypothesis Plural: hypotheses
The singular form of the plural noun smiths is smith.The singular possessive form is smith's.example: I bought this at a goldsmith's shop on Main Street.
Absract, Compound, Collective, Proper, Singular, Plural, Concrete, Possesive