Yes, "Sandra's" is a proper noun when used as a name. If it refers to a specific person or place, it is considered a proper noun and should be capitalized.
No, in English, plural nouns are not capitalized unless they are proper nouns.
Proper nouns refer to specific names of people, places, or things and are always capitalized while common nouns are general names for people, places, or things and are not capitalized.
The common noun is person; the proper nouns are Spaniard and Spain.
Common nouns: chair, cat, city, book Proper nouns: London, Starbucks, Harry Potter, Statue of Liberty
Proper nouns are specific names given to unique persons, places, or things, starting with a capital letter. They distinguish from common nouns by pointing to a particular entity, for example, "New York City" instead of just "city." Proper nouns are used to identify individual entities and convey specificity in communication.
Bruno Sandras was born in 1961.
Gustave Sandras died on 1951-06-21.
Gustave Sandras was born on 1872-02-24.
In the question above, nouns and sentence are the only nouns. Neither of which are proper nouns.
Proper nouns are specific names given to unique persons, places, or things, starting with a capital letter. They distinguish from common nouns by pointing to a particular entity, for example, "New York City" instead of just "city." Proper nouns are used to identify individual entities and convey specificity in communication.
Proper nouns refer to specific names of people, places, or things and are always capitalized while common nouns are general names for people, places, or things and are not capitalized.
Gatien de Courtilz de Sandras was born in 1644.
Gatien de Courtilz de Sandras died in 1712.
proper nouns = Helen, Romecommon nouns = table, computer
There are no proper nouns in the sentence.
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Proper nouns are always capitalised, but adjectives are not.