Look for "Разбор учебника" (Textbook Breakdown) videos that explain why a certain grammar rule is used.
Enjoy English 3 класс. Рабочая тетрадь. Урок 7 video uroki po uchebniku biboletovoi 3 klass skachat
Teachers often use visual aids (like the "triangle" symbols used in Biboletova's method) to explain verb forms like am/is/are and modal verbs like can . video uroki po uchebniku biboletovoi 3 klass skachat