Past simple and past continuous together.> To talk/writing about something was happening and then interrupted.
> Om the praten/schrijven over iets dat bezig was en toen werd onderbroken.
Example: They were eating when my friend called.
In the sentence the past simple is the shorter action, the interruption. The past continuous is the longer lasting action, that was happening.
In de zin is de Past simple de korte actie, de onderbreking.
De past continuous is de langere actie, die bezig was.