Answer

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