Answer:
The computer will be repaired by a workman tomorrow.
Step-by-step explanation:
To change a sentence from the active voice to the passive voice, we must shift the focus on the subject & focus in what the action is.
Here, the workman was given more importance in the active voice but while changing to the passive voice, we gave more importance to the computer's repairment.
=》Refer to the attachment for better understanding on active & passive voice & on how to change them.
Hope it helps ⚜