Question

they are chopped down and turn up.(change the voice)​

Answer 1

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$\mathfrak{The\:Answer\:is}$

They have been chopped downed and turned up.

$\boxed{Hope\:This\:Helps}$

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Answer 2

Correct Question :-- they have chopped down and turn up.(change the voice)

Points :--

There are two basic rules for converting sentences from Active Voice into Passive Voice, which are common for all tenses :---

1) The places of subject and object will be interchanged in the sentence.

Active voice :- Sub. + have/has + P.P.form of verb + obj.

Passive voice:- Sub.(obj.) + have been/has been + P.P. form of verb + prepositional by + obj.(Sub.)

2) Only 3rd form of the verb or Past Participle (e.g. written) will be used as a main verb in Passive Voice.

Answer :---

→ Active :- they have chopped down and turn up..

→ Passive :- They have been chopped down and turned up .