Definition:
new refers to something that has never been previously experienced or known, or something that has recently been introduced or come into use. It functions as an adjective when describing a person, place, or thing.
Rules:
rules for usage include the use of articles - when used in reference to a person or a thing, it is preceded by a definite article for previously encountered persons or things, and by an indefinite article for newly encountered persons or things.
Examples:
1. She just brought home a new puppy.
2. You need to buy some new clothes for your trip.
3. Two new students joined the school this year.
Tips:
when new is used as an adjective, it can be followed by a singular or plural verb.