Hi psychouvita,
Future perfect has the meaning of �past in the future�. It refers to something which is in the past from a viewpoint in the future.
e.g. I am sure that the parcel will have arrived by Tom�s birthday.
Next year is our silver wedding: that means we�ll have been married for 25 years.
i>>>>>>>>>>>>>>>>>>>>>>>i>>>>>>>>>>>>>>>>>>>>i
i i <<<<<<<<<<<<< i
___ i__________________________i______________________ i______________
NOW past in future future
The will 1st Conditional predicts a likely result in the future (if the condition is fulfilled).
e.g. �The sky looks dark. If it rains, we�ll get wet.� �Ok. Let�s go by car.�
If your boyfriend phones, I�ll tell him you�ve gone out with your mother.
( = It is possible or likely that he will phone.)
Sorry about the diagram, there aren �t enough keyboard features that allow me to draw arrows here. Hope this helps.
Cheers,
ranclaude