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Expressing the past: yesterday, last week, past month and more
昨日 kinō yesterday 
昨日 sakujitsu the day before | yesterday 
昨夜 sakuya last evening 
昨年 sakunen last year 
先週 senshū last week (=the week before) 
去月 kyogetsu the past month 
去年 kyonen the past year 
おととい [一昨日] ototoi day before yesterday 
昨 [last]
先 [ahead]