1)Simple past: The "simple past" is used to talk about an action that ended earlier
than the current one. The duration is not relevant. The time in which the action is
situated can be the recent past or the distant past.
Frequency often, sometimes, always
I sometimes walked home at lunchtime.
I often brought my lunch to school
a specified time: last week, when I was a child, yesterday, six weeks ago
We saw a good film last week.
Yesterday, I arrived in Geneva.
She finished her work atseven o'clock
I went to the theater last night
an indeterminate time: the other day, ages ago, a long time ago People lived in
caves a long time ago.
She played the piano when she was a child
Formación del "simple past" con verbos regulares
To Walk
          Afirmativa             Negativa                Interrogativa
          I walked               I didn't walk           Did I walk?
          You walked             You didn't walk         Did you walk?
          He walked              He didn't walk          Did he walk?
          We walked              We didn't walk          Did we walk?
          They walked            They didn't walk        Did they walk?
"Simple past": verbos irregulares
Algunos verbos hacen el "simple past" de forma irregular. Estos son los más comunes.
to go
       He went to a club last night.
       Did he go to the cinema last night?
       He didn't go to bed early last night.
to give
       We gave her a doll for her birthday.
       They didn't give John their new address.
       Did Barry give you my passport?
to come
       My parents came to visit me last July.
       We didn't come because it was raining.
       Did he come to your party last week?
2)Past continuo: The "past continuous" describes actions or events situated in a
time prior to the present, whose beginning is situated in the past and which has not
yet concluded at the moment of speaking. In other words, it expresses an
incomplete or unfinished action from the past.
It is used: Often to describe the context in a story written in the past, e.g. "The sun
was shining and the birds were singing as the elephant came out of the jungle.
The other animals were relaxing in the shade of the trees, but the elephant moved
very quickly. She was looking for her baby, and she didn't notice the hunter who
was watching her through his binoculars. When the shot rang out, she was
running towards the river.”to describe an incomplete action that was interrupted by
another action or event, e.g. "I was having a beautiful dream when the alarm clock
rang." to express a change of mind: e.g. "I was going to spend the day at the
beach but I've decided to get my homework done instead." with 'wonder', to
formulate a very polite request: e.g. "I was wondering if you could baby-sit for me
tonight."
Formación del "past continuous"
The "past continuous" of any verb is made up of two parts: the past of the verb "to
be" (was / were) and the stem of the main verb + ing
 Sujeto                was/were                     raíz + ing
 They                  were                         watching
 Afirmativa
 She                   was                          reading
 Negativa
 She                   wasn't                       reading
Sujeto               was/were                     raíz + ing
Interrogativa
Was                  she                          reading?
Interrogativa negativa
Wasn't               she                          reading?
To play, "past continuous"
Afirmativa                 Negativa                  Interrogativa
I was playing              I was not playing         Was I playing?
You were playing           You were not playing      Were you playing?
He was playing             He wasn't playing         Was he playing?
We were playing            We weren't playing        Were we playing?
They were playing          They weren't playing      Were they playing?