In Russian, adjectives change to match the nouns they describe. This means they fit together in gender, number, and case.

Let’s break down the phrase "tall teacher" (высокий учитель):

1. Gender:

   • The word "высокий" (tall) is used for a male teacher because "учитель" (teacher) is a male word.
   • If you are talking about a female teacher, you would say "высокая" (tall).

2. Number:

   • For one teacher, you say "высокий учитель" (a tall teacher).
   • For more than one teacher, you say "высокие учителя" (tall teachers).

3. Case:

   • Nominative: "высокий учитель" (the subject of a sentence).
   • Accusative: "высокого учителя" (for the object of a sentence).
   • Genitive: "высокого учителя" (to show ownership).
   • Dative: "высокому учителю" (to or for a tall teacher).
   • Instrumental: "с высоким учителем" (with a tall teacher).
   • Prepositional: "о высоком учителе" (about a tall teacher).

If you learn these rules, you’ll be able to describe teachers in different ways!