All nouns -- common nouns and proper nouns -- have a gender. They are either masculine or feminine.
Although there are no rules by which the gender of all nouns can be determined, the gender of many nouns can be determined by their meaning or their ending. The gender of other nouns must be learned individually. The best way to memorize the gender of words is to memorize the article when learning a new word.
Note: Knowing the gender of every noun is important not only for the noun itself, but for the spelling and pronunciation of the words it influences in a sentence.
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