What I'm going to be describing now is...well; When 'they' start telling you something, by saying, that (they) will be "telling you", such & such.
Or,once they've (TV announcers, usually), have introduced a subject, by telling you what they are about to introduce, first.
No one (usually) catches the fact, the fact that, often you are not even actually 'told' the thing directly....that factual content is earlier on, during the intro into the introduction.
(lol).
You cannot get excessively worried, about mangled Grammer, that's for sure !
But first, what I'd like to talk about is...