Complete with the correct form of the indicated verb: Los alumnos ____ cuando la profesora habla. (dormir)
duermen = they sleep, are sleeping, do sleep
Sra
P.S. You must say what tense you are working with? It could also be the Imperfect, if you have studied that:
dormían = were sleeping or used to sleep
Sra
Los alumnos duermen cuando la profesora habla.
To complete the sentence with the correct form of the verb "dormir" (to sleep) in the present tense, you need to use the third-person plural form. The correct form would be "duermen."
So, the complete sentence would be: "Los alumnos duermen cuando la profesora habla." (The students sleep when the teacher speaks.)