We (visited / have visited) art museums in Spain several times over the years. [repeated experience]
have visited
We (have viewed / viewed) Jaume Plensa's work when we were there in 2014. [past action at a specific time]
viewed
My friend (has expressed / expressed) herself with several art displays in public spaces in the past few years. [Past experience. NO specific time]
has expressed
(Did they took down / Have they taken) down the temporary art displays yet? [question with YET]
Have they taken
(Have you shown / Did you show) your art work to the gallery last week? [Question with LAST WEEK]
Did you show
Jaume Plensa (studied/ has studiend) art at the Llotja School of Art and Design when he was young. [specific time in the past]
studied
In 2011, Plensa (showed/ has showed) many of his works at an exhibition in England. [specific time in the past]
showed
For years now, Plensa (has been/ was) an art teacher at two big art schools. [action that started in the past and continues in the present]
has been
Between 1996 and 2008, Plensa (worked/ has worked) with others to create theater and opera sets and costumes. [Action started and finished in the past]
worked
People throughout the world (have enjoyed/ enjoyed) Plensa's sculptures in public spaces. [NOT specific time]
have enjoyed
