英语里月份、星期、季节、年、具体的日期、前用什么介词月份、季节、年前一般用in如:inJanuary/spring/1990星期前一般用on如:onMonday/Tuesday具体的某个日期,或某个早上,下午等等。用on如:on12th,January,1990.onthemorningof12th,May.