Irregular verbs

Across

4. spend
6. meet
9. lead
12. come
13. run
14. think
15. sing
16. lend
17. sleep
18. forget
20. try
21. say

Down

1. catch
2. understand
3. mean
4. swim
5. fly
7. buy
8. teach
10. drink
11. choose
16. lie
19. read