Welcome to the forum, Gianni X. Wong.
Try to relax a little. We are happy to deal with one small point at a time.There is no such 'phrase' as to have yet to.That said,my very first question I shall post to this forum is the proper labeling of the phrase " to have yet to".I'm afraid there is not much point in discussing this, because the sentence 'UPS has yet to come' is, in most contexts, not natural English. It makes sense only if both parties in the dialogue know that UPS is a delivery service that, in this context, is expected to come.For example,in the sentence "UPS has yet to come",is the phrase "has yet to come" the complete verb phrase of the sentence,with the auxiliary being "has yet to" and the main verb "come"?
I think we'd better wait for comments from others before we look at the other parts of your post
Interested in Language