The French translation for “If today is Tuesday, yesterday was Monday.” is Si aujourd’hui c’est mardi, hier c’était lundi.. The French, Si aujourd’hui c’est mardi, hier c’était lundi., can be broken down into 7 parts:"if" (si), "today" (aujourd’hui), "this is; it is" (c’est), "Tuesday" (mardi), "yesterday" (hier), "it was" (c’était) and "Monday" (lundi).