Complete the sentence with the IMPERFECT form of the verb in parenthesis.Luis y Sergio   (pelearse) mucho en la escuela.

To complete the sentence with the imperfect form of the verb "pelearse" (to fight), we first need to recognize the appropriate form in Spanish. The imperfect tense is used to describe past actions that were habitual or ongoing.

Step-by-Step Solution

1. Identify the Subject: The subjects are "Luis y Sergio," which is a plural subject.
2. Conjugate the Verb: The verb "pelearse" in the imperfect tense for the third person plural (ellos) conjugates to "se peleaban."
3. Placement in Sentence: Insert the conjugated verb into the sentence.

Completed Sentence

Luis y Sergio se peleaban mucho en la escuela.

Additional Explanation

The imperfect tense in Spanish allows us to describe actions that were repeated or habitual in the past. In this case, "se peleaban" indicates that the fighting was a regular occurrence between Luis and Sergio during their time in school. Using the imperfect also suggests that their fighting might have been an ongoing aspect of their relationship rather than a single incident. Thus, adding "mucho" (frequently) further emphasizes the regularity of their altercations, and the construction "se peleaban" captures the reflective nature of the verb, indicating that they fought with each other.