In general, it is a poor idea to use words themselves as the internal representation. If we represent John loves Mary as LOVES(JOHN,MARY) there can be only one John and one Mary.
LOVES(PERSON1,PERSON2)
NAME(PERSON1,JOHN)
ISA(PERSON1,PERSON)
SEX(PERSON1,MALE) . . .
PERSON LOVINGS
^ ^
|Isa |Isa
Name | Agent | Obj
JOHN < ------ PERSON1 < --- LOVES1 ----> ...
Sex/
/
MALE