Final answer:
The correct future form of hablar for ellos (they) is hablarán.
Step-by-step explanation:
The correct future form of hablar for the subject ellos (they) is hablarán.
For example, in the sentence 'Ellos hablarán con la maestra' which means 'They will speak with the teacher,' the correct form of hablar is hablarán.
This future tense form is used when referring to actions that will happen in the future.
Learn more about Future forms of the verb hablar