Proper nouns represent specific names of people, places or organizations, and proper nouns are generally unique. Proper nouns usually have no plural form, with a few exceptions.
For example:
What are the proper nouns in English: names and places: Jenny Jenny China China Great Wall London;
Organization name, time, books, newspapers, etc. : United Nations Bank of China, Bank of China, Sunday, May, Sunday Times;
Names and personal titles of family relations: Mommy's mother, Dr. Blake, Dr. Hopkins;
Precautions for proper nouns:
Because proper nouns are unique, in general, the first letter of proper nouns should be capitalized, and the indefinite article "a" cannot be added before proper nouns, nor can the "-s" indicating plural forms be added at the end of proper nouns. For example:; Beijing is the capital of China. ; Beijing is the capital of China.
But sometimes proper nouns can be transformed into common nouns, which have the characteristics of common nouns, that is, the indefinite article "a" can be added before it and the "-s" indicating the plural form can be added after it.
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The following is an example of proper nouns being converted into countable common nouns: A Mr. Green called just now. ; A Mr. Green called just now. (At this time, a Mr. Green = a person named Mr. Green); There are three Johns in this class. ; There are three people named John in this class.