写出下列单词的过去式形式。

1. buy______ 2. do______ 3. bring ______ 4. make______ 5. arrive______ 6. come______ 7. forget______ 8. teach______ 9.can______ 10.will ______ 11. skate ______ 12. take______ 13. say ______ 14. have______ 15. put ______ 16. see ______ 17. go ______ 18. eat ______ 19. is______ 20.grow ______

1.bought 2.did3.brought 4.made
5.arrived 6.came7.forgot 8.taught
9.could10.would 11.skated 12.took
13.said14.had 15.put16.saw
17.went18.ate 19.was 20.grew