Explanation
You must apply to the judge for a pardon
آپ کو جج کے پاس معافی کے لیے درخواست دینی چاہیے۔
We use “apply to” when we say where we are applying.
We use the" to" preposition with "apply" because apply to is used where we say for applying
for example: in the above sentence " we someone to apply for pardon application to the judge"
