Final answer:
The sentence 'Éramos una hermosa tarde de verano' is correctly written in the imperfect form of the verb.
Step-by-step explanation:
The sentence Éramos una hermosa tarde de verano is correctly written in the imperfect form of the verb. The imperfect tense is used to describe ongoing or habitual actions in the past. In this sentence, the verb 'éramos' is the imperfect form of the verb 'ser' (to be), indicating an ongoing condition in the past. The imperfect tense is often used to set the scene or describe the background of a story.
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