Si no recuerdas cómo se forma alguna de estas dos formas verbales te recomiendo que mires la lección del Past Simple y el Past Continuos y que hagas sus correspondientes ejercicios primero.
Elige entre las dos opciones en cada oración:
- I was reading / read a book when my mother was coming / came in.
- He was taking / took a shower when the lights went / were going off.
- The rain started / was starting to fall while we walked / were walking in the park.
- We were eating / ate our dinner when someone knocked / was knocking in the door.
- They were walking / walked to school when suddenly they saw / were seeing an unusual light.
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