Question

put up the tent under the tree ( voice change )​

Answer 1

Answer:

the tent has to be put up under the tree

Answer 2

Q. Put up the tent under the tree.  

This statement is in active voice.

Answer.

So , the answer will be in passive voice- The tent is put up under the tree.

                                                                                             OR

                                                             Let the tent be put up under the tree.