Question

voice change = Do your duty at once​

Answer 1

You are advised to do your duty at once.

Answer 2

It can be written in the passive voice as-

Let your duty be done at once.

or

Your duty must be done at once.

• In case of active voice, the subject directly performs an action.

So, the structure is: Subject+ verb+ object

• In case of passive voice, the subject interchanges its position with the object.

So the structure is: Object+ verb+ subject

• While making the transformation, the tense remains the same, however, the form may change( for example- 'do' changes to 'done')