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Approved answer (verified by Tanit)
The advice from anon saying 'in behalf of' is correct in some contexts is wrong. It is always 'on behalf of'.
use ON behalf of if you are representing/on part of a group.
My brother is sick. I'm writing on behalf of my brother.(=I'm writing because my brother cannot write)
I'm a lawyer. I'm acting on behalf of my client. (=My client does not know law)
I'm a doctor. I cannot act on behalf of my patient.
I have a license. I'm driving on behalf my father. He's eyes are not good for night driving.
He is a lawyer and is helping me in a disagreement. He is acting on my behalf in the matter. (=he is representing me).
Did the examples help?
Look at the subject in the second and third person ...
He is acting on my behalf in the dispute, because he is a lawyer.
You are driving on my behalf because I'm not feeling well. If the police stop us, explain them this.
They are a music group. They are performing on behalf of another group. The other group could not come.
People are waiting to help.
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