identificatory/non-identificatory: "Robert's mother would not denounce him to the police"

--- from Grice, PPQ, vol. 67, p. 28.

Davidson is unable to attach non-identificatory status to notably identificatory devices like definite descriptions.

In

"Robert's mother would not denounce him to the police"

the utterance refers

BOTH to "a particular lady"

and

"at the same time, gives a description of this
lady which explains or is otherwise relevant
to the presence or absence of the phenomenon
mentioned in the predicate."