1. Regular Verbs
1.1. Add "ed" to the root of the verb
1.1.1. Selected Accepted Talked Travelled, etc.
1.2. Add "d" if the word already ends with "e"
1.2.1. Typed Admired Lived Achieved, etc.
1.3. Change "y" for "ied"
1.3.1. Studied Replied Cried
2. Irregular verbs
2.1. They do not follow an specific pattern
2.1.1. Brought Saw Felt Ate,etc.
3. Pronunciation
4. Simple Past
5. Function
5.1. Action or existense in the past
5.1.1. Time expresion+past tense of the verb
5.1.1.1. Frecuency
5.1.1.2. A certain point in time
5.1.1.3. An indefinite point in time
6. Structure
6.1. Affirmative
6.1.1. Subject+past form of the verb+complement
6.1.1.1. I studied my classes yesterday.
6.2. Negative
6.2.1. Subject+ auxiliary "did"+not+base form of the verb
6.2.1.1. Martin did not come to the meeting.
6.3. Interrogative
6.3.1. "Did"+subject+base form of the verb+complement
6.3.1.1. Did you watch the movie I recommended for you?
6.3.2. Wh-word+did+subject+base form of the verb+complement
6.3.2.1. Where did you get that haircut?
6.4. Contracted form
6.4.1. Did not --> Didn't
6.4.2. Was not --> Wasn't
6.4.3. Were not --> Weren't