Past continuous
The FORM
AFFIRMATIVE
Subject+ Was+V+ing
I/HE/SHE/IT
Ex: He was playing basketball yesterday afternoon.
Subject+Were+V+ing
YOU/WE/THEY
Ex: We were reading books last week,
NEGATIVE
Subject+wasn't+V+ing
Ex: It wasn't raining last monday.
HE/SHE/IT
Subject+Weren't+V+ing
Ex: They weren't having a party last weekend
You/We/They
INTERROGATIVE
Was+Subject+V+ing?
Ex: Was she cooking dinner last night?
Were+Subject+V+ing?
Ex: Were you living in Spain last year?
The USE
We use the past continuous for an action that was already happening at a particular time in the past.
ADVERBS
YESTERDAY
Last saturday
Last week