|I was walking down the street when it began to rain.|
(-) S + was/were + not + v-ing + O + adverb of time
(?) was/were + S + v-ing + O + adverb of time?
Indicate an activity or situation was in progress at particular time in the past.
At 08.00 pm yesterday we were playing video game.
Both action that occurred in the same time, but one action began earlier and was in progress when the other action occurred.
I was watching TV when she arrived. (The past progressive form ‘watching TV’ happen first and for the past form is second).
While I was studying last night, she called me.
Frequently used adverb
When…, while.., at… o’clock yesterday and other in the past.
Were: they, we, you
Was: I, he, she, it, name (Jhon).