Cette is used with feminine singular nouns. Ces is used with plural nouns, both masculine and feminine. Ce garçon est très intelligent. – This/That boy is very intelligent. Cet homme est très beau. – ...
Adjectives must agree with the noun in gender (masculine or feminine) and number (singular or plural). Make most adjectives agree with the nouns by adding 'e', 's' or 'es'. Position of adjectives in ...