Golden
“You never fail until you stop trying!” - A.Einstein
Academy of English Language :-)
Similar to past simple, with a specific time started and ended but this tense is used in the middle between the starting and finishing time specifically.
I was eating an apple when it rained.
I was eating an apple at 7 last night.
Opposite
I was not eating an apple when it rained
I was not eating an apple at 7 last night.
This tense can also be used when other things happened at the same time in the past during your past action.
I was eating an apple when you were eating a cake.
Opposite
I was not eating an apple when you were eating a cake.
Or when something happen regularly in the past.
Peter was always protecting me.
I was always eating an apple while studying.
Opposite:
Peter was not always protecting me.
I was not always eating an apple while studying.
Past Continuous!
I was cooking when she walked into the kitchen.