Question

change the voice they will be watching a movie​

Answer 1

Answer:

the movie is watched by them

Answer 2

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A movie will be being watched by them.

Structure ↴

Subject + shall/will + be + being + past participle form of the main verb + Object

Extra Information ↴

(1) The object in the active voice becomes the subject in the passive voice.

(2) The subject in the active voice becomes the object in the passive voice. It is preceded by the preposition 'by'.

(3) The main verb (the finite verb) of the sentence is changed into its past participle form, and it is preceded by the correct form of 'be' verb in the passive voice.