Final answer:
The sentence 'El niño leia el libro' is incorrect because the verb form 'leia' should be 'leía' to match the subject 'el niño' in the imperfect tense.
Step-by-step explanation:
The sentence 'El niño leia el libro' is incorrect because the verb form 'leia' should be 'leía' to match the subject 'el niño' in the imperfect tense. The correct form should be 'El niño leía el libro', where 'leía' is the correct imperfect form of the verb 'leer' (to read) for the third person singular.
Learn more about Imperfect verb form in Spanish