Réponse :

Je vais vous faire un petit rappel des règles et essayer de faire votre exercice

Explications :

on utilise le preterit BE+ING pour :

prétérit BE+ing : action en cours de déroulement à un moment du passé

Prétérit simple : action brève qui peut interrompre ou se passer pendant l'action en cours

prétérit BE+ing  +  prétérit simple : l'action en BE+ing sert de cadre à l'action au prétérit simple

Ainsi dans votre exercice ça donne :

1) I read while my mother was cooking delicious scones.

2) What were you doing between 5 pm and 6 pm?

3) John and Lisa weren't doing their homework when their mother came home. They were playing video games.

4) I liked Mary very much but she was always complaining

5) We were preparing a secret party for her birthday when she came in the room

Il est possible que je me sois trompée mais j'ai tenté ^^'

Bonjour

1- I was reading while my mother was cooking delicious scones.

les 2 actions étaient simultanément en cours...

2- What were you doing between 5 pm and 6 pm ?

3- John and Lisa weren't doing their homework when their mother came home. They were playing videogames.

4- I liked Mary very much but she was always complaining.

5- We were preparing a secret party for her birthday when she came in the room.

preterit simple = pour une action passée, soudaine et terminée.

preterit be V-ing = pour des actions passée qui étaient en cours, "en train de"...

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Bonne journée ☺☺☺