-you showed
The word mostrasteis is the preterite form of mostrar in the second person plural.
See the full mostrar conjugation


El comportamiento que mostrasteis en vuestro plan de boda no fue profesional e inaceptable.
The behavior you two displayed with your wedding planner...was unprofessional and unacceptable.
Después de la hospitalidad que me mostrasteis ambos, esto es lo menos que puedo hacer.
After the hospitality you showed me, this is the least I can do.
Want to Learn Spanish?
Spanish learning for everyone. For free.
SpanishDict Premium
Have you tried it yet? Here's what's included:
Cheat sheets
No ads
Learn offline on iOS
Fun phrasebooks
Learn Spanish faster
Support SpanishDict