Bonjour

prétérit simple = action passée (souvent datée) terminée  /   courte,  soudaine dans une phrase ou le past BE+ing est aussi utilisé

prétérit be+ V-ing = action passée qui était en cours

EXO

1- While I was watching TV, the phone rang.

2- When the teacher entered the classroom, the students were working on assignments.

3- It was raining heavily when I left home.

4- While they were having dinner, the power went out.

5- At 8:00 PM yesterday, I was studying  for my exams.

6- While she was reading a book, her brother was playing videogames. ( 2 actions simultanées en cours)

7- When I called, she was cooking dinner in the kichen .

8- The children were playing outside when it suddenly strated raining.

9- While Tom was driving to work, he was listening to music. ((actions en cours simultanément)

10- Lest night, as we were watching a movie, there was a loud noise outside.

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bonne fin de journée et bonnes fêtes☺☺☺