L'ausiliare è già be, quindi non serve mai did.
Negativo
Not dopo was / were:
- I wasn't listening.
- They weren't working.
Interrogativo
Si inverte soggetto e was / were:
- Was he sleeping?
- Were they waiting for us?
La parola interrogativa va davanti: What were you doing?
Attenzione
Did you working? mette due ausiliari dove ne serve uno. Si dice Were you working?