I saw a dog and a cat. The most important distinction is between definite and other nouns. A. Most generic nouns look just like indefinite nouns. Singular and plural generic count nouns can be almost interchangeable. A book makes a good gift for a friend.
Books make good gifts for friends.
An equestrian is a person who rides a horse. These are much less common than the ones that look like indefinite nouns. This occurs most often in formal science writing. She plays the piano . This is the least common kind of generic nouns, usually referring to a religiously, politically, or professionally-based group of people.