Ellos estaban mirando la televisión.
Explanation:
To change the verb to indicate that it was in progress at a time in the past using the correct form of Estar, we'd need to use the Past Progressive Tense. This tense is used by using the verb estar conjugated in the imperfect tense followed by a verb conjugated in Past Participle (Carried out adding ndo). On the other hand, the imperfect is used to talk about habitual actions in the past. Therefore, the sentence:
Ellos miraban la televisión.
Changes to Past Progressive as follows:
Ellos estaban mirando la televisión.
Learn more:
Present Progressive: https://brainly.com/question/11410219
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