Answer :
Answer and explanation:
A possessive noun is formed by adding and apostrophe ( ' ) and an -s to the ending of the noun that indicates the possessor, the owner. If the noun is plural and already ends in -s, only the apostrophe is necessary. Study the examples below:
- The boy's toy
- The boys' toys
Note: the possessive noun can also be used to indicate origin.
Since you did not underline any groups of words, I will use a possessive noun at every possible place in the sentences given.
1. Charles Green was the worst balloonist in Britain.
2. With a colleague's help, he prepared for flight.
3. Suddenly, the balloon's ropes slipped off.
4. How surprised Cheltingham's citizens must have been to hear the flyers' calls for help!