Irregular verbs

Across

2. simple past of 'ring'
3. simple past of 'know'
8. simple past of 'find'
10. simple past of 'sleep'
11. simple past of 'catch'

Down

1. simple past of 'give'
4. simple past of 'write'
5. simple past of 'understand'
6. simple past of 'forget'
7. simple past of 'drive'
9. simple past of 'see'