英语中,在某一时间前有时加介词有时不加,请问怎么区别和运用?_百度...答:在带有this,next,last,one等时间状语前,不能加介词,这属于英文习惯用法。e.g. this morning,this evening, next week,next month, last night, last year,last Sunday,one morning,one day etc.其他一般要加介词:e.g. in the morning/afternoon/evening in January/February/March in spring/s...