Final answer:
The verb form 'va' should be filled in the blank in the given sentence.
Step-by-step explanation:
The correct verb form to fill in the blank in the sentence 'Hoy, Lisette____________ a la biblioteca para estudiar.' is 'va'.
The verb 'va' is in the third person singular form of the present tense, which is used when talking about 'él', 'ella', or 'usted' (he, she, you formal).
In this sentence, it indicates that Lisette is going to the library to study today.
Learn more about Verb forms in Spanish