prolog predicate problems

From: nissan2000 (billie_at_campus.ie)
Date: 08/16/04 

Date: Mon, 16 Aug 2004 08:39:22 -0400

Im trying to figure out how write a predicate which replaces any occurence
of a known person in a list with the word 'man'. Known colors: bob, jim,
joe.
Eg:

?-person([that,person,is,bob,they,are,jim,and,joe],R).

R=[that,person,is,man,they,are,man,and,man]
More(y/n)

Heres what i have, but i am unable to finish it.

is_man(bob).
is_man(jim).
is_man(joe).

person( [], [] ).

person( [ H | T1 ], [ choice | T2 ] :-
    ????,
    ????.

person( [ H | T1 ], [ H | T2 ] ) :-
    ????.

thanks in advance.

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