I have a question reading my grammar book explaining qui vs que... I get the usual explanations where it explained qui is used as the subject and que is used as the direct object of the dependent clause. However there came a subsequent section where it says
// Note the following sentences where qui is the object of the verb in the dependent clause. In this case, a subject noun or pronoun comes between qui and the verb form
(example) Je ne sais pas qui il est. Le président n'a pas dit qui il nommerait à ce poste. //
I'm a little confused how do these differ from sentences where que is used...? The book didn't explain further, the only difference I can sort of see when comparing the above with the que examples is in these cases where qui is used as the object the object's identity is unknown...
Thanks very much!