Examples

Past continuous (past continuous): This is when the action is performed and this continues for a while. Use "was / were" + a verb with "ing"
examples: 


I was listening to music - Estaba escuchando música

He was playing with his sister - El estaba jugando con su hermana

She was taking a bath - Ella se estaba dando un baño


They were singing an english song - Ellos estaban cantando una canción en inglés

We were eating some cookies - Estabamos comiendo unas galletas 

FORMULA DEL PASADO CONTINUO

subject + was / were + 1 > ing	1	2	3
	go	went	gone

...ing = ...ando, ...endo

Affirmative	Negative	Interrogative
I was going	I was not going	Was I going?
You were going	You were not going	Were you going?
He was going	He was not going	Was he going?
She was going	She was not going	Was she going?
It was going	It was not going	Was it going?
We were going	We were not going	Were we going?
You were going	You were not going	Were you going?
They were going	They were not going	Were they going?

Affirmative	subject + was/were + 1 > ing
I was going to New York -  Estaba (estuve) yendo a New York
You were going to New York -  Usted estaba (estuvo) yendo a New York
Negative	subject + was/were + not + 1 > ing
I was not going to New York -  No estaba (estuve) yendo a New YorkI wasn't going to New York -  No estaba (estuve) yendo a New York (contracción)
You were not going to New York -  Usted no estaba (estuvo) yendo a New YorkYou weren't going to New York -  Usted no estaba (estuvo) yendo a New York (contracción)
Interrogative	Was/Were + subject + 1 > ing ?
Was I going to New York ? -  ¿Estaba (estuve) yendo a New York ?
Were you going to New York ? -  ¿Estaba (estuvo) usted yendo a New York ?

Yo estaba trabajando en VodafoneI was working at VodafoneYo trabajaba en VodafoneI was working at VodafoneYo estaba caminando por la playaI was walking down the beachElla estaba mirando por la ventanaShe was looking out of the windowYo estaba pensando en tiI was thinking about youObama estaba hablandoObama was talking