We use the past continuous to describe an interrupted activity which continued for a period in the past and to talk about things happening for a continuous period in the past.

to say that somebody was in the middle of doing something

He was playing computer games.

for two things happening at the same time

He was playing computer games while she was watching TV.

for things you were in the middle of doing when another thing happened

He was watching TV when Tom arrived.

We form the past continuous tense with the helping verb was/were + present participle (V1 + -ing).

IwasgoingweweregoingYouweregoingyouweregoingHewasgoingtheyweregoingShewasgoingIt wasgoing

We form questions by using the helping verb was/were + subject + present participle (V1 + -ing).

Was Igoing?Were wegoing?Were yougoing?Were yougoing?Washegoing?Were theygoing?Wasshegoing?Wasitgoing?

We form the negative with the helping verb was/were + not + present participle (V1 + -ing).

I was not going we were not goingYouwere not going you were not goingHewas not going they were not goingShewas not goingIt was not going