Final answer:
The given sentences are examples of the imperfect tense in Spanish. The imperfect tense is used to describe ongoing or continuous actions in the past.
Step-by-step explanation:
The given sentences are examples of the imperfect tense in Spanish. The imperfect tense is used to describe ongoing or continuous actions in the past. In the sentence 'En el supermercado', the verb is in the imperfect tense because it describes a continuous action of being in the supermarket. In the sentence 'El ladrón entró y corrió', the verb 'entró' is in the preterite tense (past simple) because it describes a completed action of the thief entering the supermarket, while 'corrió' is in the imperfect tense because it describes the ongoing action of the thief running. The sentence 'Llevaba también pantalones negros' is in the imperfect tense because it describes the continuous action of the thief wearing black pants.
Learn more about imperfect tense in Spanish