Entrance 3: Past simple and past continous

As we can imagine, there are some differences between past continous and past simple. 
The past simple is used to describe an action that is already finished and it´s no progressing, also,  is formed using was/were + past participle. 
The past continous is different because in this one we describe ac action that ocurred in the past but is still happening, It uses was or were + verb-ing . In the verbs we need to add an "ed" at the end (to the regular verbs) and for the irregular verbs are not a "exact rule" to follow and they can change mostly.

We can see some examples here:

Past Simple: 

You called Debbie.
She washed her car.
Last year, I traveled to Japan.

Past Continous:

I was watching television when he arrived.
 While I was eating, the telephone rang
They visited Sydney when they were traveling in Australia.