The sentence for captain is:The person in charge of a ship to be a Captain.
The word captain is a common noun, a word for any captain, a person. A proper noun is a name for a specific person, place, thing, or a title,If the sentence is, "a captain strolled the deck", captain is a common noun. However when being used as a name like Captain Crunch, or the movie 'Captain America', captain is a proper noun.
The noun captain is an abstract noun, a word for the position or the rank of a person. There is nothing physical about a person that makes that person a captain; the fact that a person is a captain is something that is learned, known, or understood.
A subject in a sentence is who, what, or where the sentence is about.
This is a sentence. A prisoner has to serve the sentence the judge gives him.
This example sentence uses the word 'sentence' in an exemplary fashion.
The captain laughed with glee for they had reached their destination
The captain said about face!
is the captain of the cheer- leading squad
Example sentence - Captain Hook was a pirate.
aye, aye captain
The captain abandoned his ship.
The captain frowned at hi frightened crew. She had been captain of this team for over three years. The captain inspected the damage on his ship.
He proudly announced that he was voted captain of the football team. The captain announced that the plane would take off shortly. He's an army captain with a spotless record of service to his country.
The mutineer devised a plan to kill his captain.
We've run aground on a sandbar, Captain!
The captain fell out of the skiff. The skiff ran aground.
Sure! "She is a doctor." In this sentence, "doctor" is the predicate nominative as it renames the subject "she". "He became the captain." In this sentence, "captain" is the predicate nominative as it renames the subject "he".