Wie auch im simple present wird die Verlaufsform im simple past mit der Form von to be und dem Partizip I gebildet. Die Bildung des past continuous folgt also dem gleichen Muster. Hier handelt es sich allerdings um das simple past von 'to be'.

Beispiel
Form von 'to be' + Vollverb + Verdopplung Konsonanten + Endung -ing = Verlaufsform
I was read ing I was reading
you were jump ing you were jumping
he was buy ing he was buying
we were sell ing we were selling
you were wait ing you were waiting
they were write ing they were writing