Ответ:
1. Do-did, 2. Read-read, 3. Can-could, 4. Forget-forgot, 5. Make-made, 6. Give-gave, 7. eat-ate, 8. drink-drank, 9. buy-bought, 10. go-went, 11. say-said, 12. feel-felt, 13. run-ran, 14. see-saw, 15. find-found, 16. lose-lost, 17. swim-swam, 18. build-built.