We were playing cards in our tent while / when somebody stole our bicycles.
While / When they were playing volleyball on the beach, in started to rain.
Where were you going while / when we met you?
Were you watching the match while / when I phoned you?
While / When I wasn’t watching, she jumped out of the box.
We were cycling in the forest while/ when we saw a bear.
While + past continuous (czasownik z końcówką ING)
When + past simple (czasownik z końcówką ED lub 2 forma jeżeli czasownik jest nieregularny -> wrote, ran, ate, drank itd)