Question

( Someone is following us ) change into passive voice

Answer 1

We are being followed by someone .



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Answer 2

The answer is: we are being followed by someone. Here the sentence has been converted from active voice to passive voice and no change of meaning is done with the same consistency of the tense.

However, in this modification the subject and object has been interchanged keeping the symmetry of the meaning. In the first sentence someone was the subject but in the passive sentence we is the subject.