We are chopped down.
The sentence formation here is incorrect. It should be
"We are being chopped down"
The sentence is in passive voice.\
If you want to change an active-voice sentence to passive voice, consider carefully who or what is performing the action expressed in the verb, and then make that agent the object of a by the...phrase. Make what is acted upon the subject of the sentence, and change the verb to a form of be + past participle
Hence the answer to this would be:
"They are chopping us down".