Agreement of past participle with avoir
http://grammaire.reverso.net/index_alpha/Fiches/Fiche204.htm
Prepositions
http://french.about.com/library/weekly/aa062400c.htm
http://www.lire-francais.com/grammair/gg_local.htm
Means of transportation
http://www.bonjour.org.uk/transports/default.htm
Travel, holidays, tourism
http://www.bbc.co.uk/education/languages/french/experience/travel/index.shtml
http://cr.middlebury.edu/public/french/Lexique//vacances/vac_mainpage.html
