写出下列单词的过去式
1. be________ 2. have/has___ _____ 3. do/does_________
4. sit________ 5. hear____________ 6. see_____________
7. say________ 8.take_____________ 9.look____________
10. stand ______ __ 11. run____________ 12. jump__________
13. want_________ 14. let___________ 15. get___________
16. fall___________ 17.hit__________ 18. find__________
19. go___________ 20. pass________ 21. read__________
