Final answer:
The imperfect form of the verb in the sentence "El niño leía el libro." is correct in Spanish.
Step-by-step explanation:
The imperfect form of the verb in the sentence "El niño leía el libro." is correct. In Spanish, the imperfect tense is used to describe ongoing or habitual actions in the past. In this sentence, the verb "leía" is the imperfect form of the verb "leer" (to read) and it correctly indicates that the boy was reading the book in the past.
Learn more about Imperfect tense in Spanish