The word passenger's is the singular possessive noun.
The plural form of the plural noun passengers is passengers'.Example: All of the passengers' luggage has been stowed.
The plural possessive form is passengers'.
The possessive singular noun is explorer's. The possessive plural noun is explorers'.
The possessive form for the noun coyote is coyote's.
The possessive noun of "zoo" is "zoo's."
The possessive form for the noun preacher is preacher's.
The possessive noun for laboratory is laboratory's.
No, he is not possessive. The possessive form would be his.
The possessive form for the noun oxygen is oxygen's.
The possessive form for the noun coyote is coyote's.
The possessive form is grandson's.
The possessive form is island's.