Решение:
- to be: was/were, been
- to go: went, gone
- to spend: spent, spent
- to come: came, come
- to run: ran, run
- to see: saw, seen
- to build: built, built
- to buy: bought, bought
- to bring: brought, brought
- to burn: burnt/burned, burnt/burned
- to give: gave, given
- to take: took, taken
Ответ: 1) was/were, been; 2) went, gone; 3) spent, spent; 4) came, come; 5) ran, run; 6) saw, seen; 7) built, built; 8) bought, bought; 9) brought, brought; 10) burnt/burned, burnt/burned; 11) gave, given; 12) took, taken.