demandaríais
-you would sue
The word demandaríais is the conditional form of demandar in the second person plural.
See the full demandar conjugation

demandar

Cuando os registrasteis en la Colosseum, firmasteis un documento diciendo que no demandaríais a la universidad.
When you registered at Colosseum, you signed a document saying you wouldn't sue the school.
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