Answer:
Step-by-step explanation:
In the sentence "The King and queen live in the palace," there are two common nouns and two proper nouns.
"King" is a common noun because it refers to a general category of people, not a specific individual.
"Queen" is also a common noun for the same reason.
"The King" is a proper noun because it refers to a specific individual who holds the title of King.
"Queen" can also be considered a proper noun if it refers to a specific individual who holds the title of Queen.
Therefore, the sentence contains two common nouns ("king" and "queen") and two proper nouns ("The King" and "Queen").