Common nouns are:a.General names for people, places, or thingsb.Singular and properc.Abstract and uncountabled.Specific and capitalized

Common nouns are:

a. General names for people, places, or things. They are not specific names, so they don't refer to specific individuals or entities. For example, "city", "dog", "book".

b. They are not necessarily singular and proper. Common nouns can be both singular (e.g., "cat") and plural (e.g., "cats"). They are not proper nouns, which are the specific names of people, places, or things (e.g., "John", "Paris", "Microsoft").

c. They can be abstract or concrete, but not necessarily uncountable. Abstract nouns refer to ideas or concepts that we can't physically touch (e.g., "love", "freedom"), while concrete nouns refer to physical entities that we can perceive with our senses (e.g., "apple", "table"). Some common nouns are uncountable (e.g., "milk", "music"), but many are countable (e.g., "cup", "song").

d. They are not specific and capitalized. Common nouns are general, not specific, and they are usually not capitalized unless they begin a sentence or are part of a title. Proper nouns, on the other hand, are always capitalized.