From the questions you've asked recently keannu, the author of your grammar book appears to know what s/he is talking about
Edit: as per 5jj's post further down, this wasn't actually my original post. It's 5jj's. Sadly, (or perhaps luckily for the rest of you) I have no recollection of what I originally wrote except it was something to do with using "He's the man!" meaning "He's the best!"
Student or Learner