Cho dạng quá khứ của động từ sau Ex : to help _helped_ 1. To visit 2. To arrive 3. To remember 4. To return 5. To rent 6. To receive 7. To talk 8. To stop 9. To look 10. To move 11. To watch 12. To learn 13. To be 14. To go 15. To buy 16. To take 17. To see 18. To think 19. To wear 20. To put 21. To give 22. To eat 23. To teach 24. To make