Past Simple 

Afirmativa: 

Regulares + ed 

Paul watched Tv.

Paul saw a film.

Negativa: 

Did+ not + infinitive

I didn't go to spain.

Mary didn't watch Tv.

Interrogativa:

Did + subject + infinitive + ?

Did you go to Spain?

Did Mary watch Tv?

Past Continuous:

Afirmativa:

Subject + were + verb + ing

               was

Mary was going to school.

You were watching Tv.

Negativa:

Subject + were + not +verb + ing

              was 

Mary wasn't going to school.

You weren't watching Tv.

Interrogativa:

Were

                + subject + verb + ing +?

Was

Was Mary going to school?

Were you watching Tv?