Ответ:

eat, ate, ate; speak, spoke, spoken; be, was/were, been; think, thought, thought; tell, told, told; sing, sang, sung; write, wrote, written; begin, began, begun; put, put, put; cut, cut, cut; know, knew, known; keep, kept, kept; lose, lost, lost; buy, bought, bought; win, won, won; understand, understood, understood

Объяснение: