Question

they are cutting the tree

Answer 1

Then go and stop it........
What are you doing here....

Answer 2

⭐ Hello Mate⭐
✔️Here is your answer ✔️
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The tree is being cut by them.

$\color{red}{Note}$

If in active voice, the sentence is in present continuous tense and there is a use of is /am /are then while changing in passive voice, there will be use of word 'being' with helping verb according to the subject. In the passive voice, we will always use the past participle form of the verb.

✌️Hope it helps you ✌️
☺️ Thank you ☺️