RULE 1
Action that continued in the past
RULE 2
Form was/were + ing
I was reading
RULE 3
interagtive and negative
I was
Was i ?
I was not
EXAMPLES
I was watching film yesterday.
They were laughting at me.
He was sick last week.
The sun was shineing every day that summer.
I was making dinner when she arrived.
At 6 o’clock, I was eating dinner.