These change completely. Memorize them!
Be → Was / Were Съм → Бях
Do → Did Правя → Направих
Go → Went Отивам → Отидох
Have → Had Имам → Имах
Get → Got Взимам → Взех
See → Saw Виждам → Видях
Eat → Ate Ям → Ядох
Drink → Drank Пия → Пих
Buy → Bought Купувам → Купих
Think → Thought Мисля → Мислех
Make → Made Правя → Направих (създ.)
Take → Took Взимам → Взех
Come → Came Идвам → Дойдох
Say → Said Казвам → Казах
Tell → Told Казвам (на някого) → Казах
Give → Gave Давам → Дадох
Know → Knew Знам → Знаех
Write → Wrote Пиша → Писах
Read → Read (Red) Чета → Четох
Sleep → Slept Спя → Спах