Who is he?
In last week's tennis match, Djokovic imitated Roddick's serve because he was funny.

A:
Djokovic

Who is they?
Chase Sapphire has a 24 hour service line for card holders since they chose the card for everyday available support when traveling.

A:
card holders

Who is he?
Bob cooked omelets for Jack, because he was hungry.

A:
Jack