Tessie Sabbag wrote: >> I remembered learning in teacher's college about some rules as to when to use: at / to / in / on. < snip > Please email me: tessiesabbag@xxxxxxxxx << http://grammar.ccc.commnet.edu/grammar/prepositions.htm http://www.englishclub.com/grammar/prepositions-at-in-on-time.htm http://www.google.com/search?client=gmail&rls=gm&q=rules%20at%20to%20in%20on http://www.detailenglish.com/index.php?page=articles&op=readArticle&id=232&title=Rules-For-Prepositions-in-on-at-to http://www.englishcorner.vacau.com/grammar/rules/inonattim.html http://www.blurtit.com/q641498.html