Active and Passive Voice
I think that car IS followING us! (Present Continuous, Active Voice) followING - gerund or verb ?
I think we ARE BEING followED. (Present Continuos, Passive Voice) followED and BEING - verbs?
I think we ARE BEING followED by Tom. (Present Continuos, Passive Voice) followED and BEING - verbs?3rd sentence is correct?

Question

Active  and Passive Voice
I think that car IS followING us! (Present Continuous, Active Voice) followING - gerund or verb ?
I think we ARE BEING followED. (Present Continuos, Passive Voice) followED and BEING  - verbs?
I think we ARE BEING followED by Tom. (Present Continuos, Passive Voice) followED and BEING  - verbs?3rd sentence is correct?

Answer

A gerund is taking the alphabetical structure of a verb in the continuous tense as in 
verb in present tense + ING 
yet it remains a noun as a  grammatical structure .
In your examples they are all verbs in active and passive voice , mentioning the active person Tom will not change anything to the structure .

Answer

Those are all verbs not gerunds !

Answer

Thanks very much James!

Answer

As Cherry says, no sign of a gerund in any of these. That would be something like "Following us is scary". The 3rd sentence is correct but would probably be more natural in active voice: "I think Tom is following us".