Use the verb estar to describe what something / someone was feeling in the past using the imperfect tense.

Answer :

You could say this ones

Yo estaba haciendo compras en el centro comercial
( I was shopping in the mall)

Estar en mi trabajo es agotador y al mismo tiempo emocionante
( doing my job is hard, although is exiting too)

Estábamos viendo una película en cines
( we were watching movies in the cinema )