The verb "быть," which means "to be," is not used much in the present tense in Russian. But it's good to understand how it works when talking about people or things.

Key Grammar Points:

1. Noun Gender and Cases:

   • Masculine: "Он учитель." (He is a teacher.)
   • Feminine: "Она ученица." (She is a student.)
   • Neuter: "Это окно." (This is a window.)

   Use the nominative case when talking about subjects.

2. Present Tense Verb Changes:
   Regular verbs change based on who is doing the action. For example:

   • "Я" (I) becomes "Я работаю." (I work.)

3. Using "быть" in the Present Tense:
   Instead of saying "Я есть студент," you just say "Я студент." (I am a student.)

4. Asking Questions:
   To ask for information, you can say:

   • "Что это?" (What is this?)
   • "Где он?" (Where is he?)

5. Matching Adjectives:
   Adjectives need to match the noun’s gender, number, and case.

   • "Это хороший день." (This is a good day.) for masculine nouns.
   • "Это хорошая книга." (This is a good book.) for feminine nouns.

Practice these points to improve your Russian speaking skills!