1. think thought thought 
2. drink drank drunk
3. sit sat sat
4. lose lost lost
5. have had had
6. hear heard heard 
7. sleep slept slept
8. find foun found
9. say said said 
10. fly flew flown 
11. read read read 
12. give gave given 
13. tell told told 
14. understand understood understood
15. come came come 
16. get got got
17. wear wore worn 
18. forget forgot forgotten