Question

what is the active voice of a sentence.. We are going to watch a movie tonight​

Answer 1

The sentence given is already in active voice.

However the passive voice is as follows -

A movie will be watched by is tonight.

Answer 2

Voice change :-

A movie is going to be watched by us tonight.

OR

A movie will be watched tonight.

Note :- Here the phrase 'by us' is not compulsory. it's up to answerer's wish he/she wanna use it or not.

Rules for changing voice :-

• Change the object of the active sentence into the subject of the passive sentence.
• Use the verb 'to be' in the same tense as the main verb of the active sentence
• Use the participle of the main verb of the active sentence.