先月last month先週last week先生teacher先輩senior先日the other day先々月month before last先々週week before last先祖ancestor先端pointed end先頭head祖先ancestor先行preceding先先月month before last先先月month before last先先週week before last先先週week before last先代family predecessor先だってrecently先着first arrival先天的a priori優先preference
週 しゅう
今週this week先週last week毎週every week来週next weekさ来週the week after next週week週間week再来週week after next先々週week before last隔週every other week先先週week before last