yes, that's true! Not only English but also every language. Όμως, ας είμαστε αισιόδοξοι πως κάποτε θα το δούμε κι αυτό!

learning English needs a little humor, too!!! More like a million years BEHIND schedule, αλλα τελος παντων!!!

Metro is ahead of schedule? Are you sure? xaxaxa. Your examples are very useful to me. Thanks a million! Γεια σου πατρίδα! :)

Hi Dimitri, I hope I can help. Ahead of is used in a variety of ways. Examples: Construction on the Thessaloniki metro is ahead of schedule; I let the pregnant woman go ahead of (μπροστα)me in the queue; We have a lot of work ahead of us (μας περιμενει πολύ δουλεια). prior to is used in more formal contexts. Prior to boarding, please have your boarding pass and passport ready (prior to boarding= before you board). Before can be used as a conjunction: Wash your hands before you handle food OR wash your hands before handling food ( here, you could have also said, "wash your hands prior to handling food - you will notice that prior to can be used with the -ing but NOT in the first example. So, it's really a matter of syntax, usage & register. I hope that helps.