n (1)昨天(day before the present day)[U]：～'s paper/meeting 昨日的报纸/会议; Y～was his birthday.昨天是他的生日。If today is Monday，the day before～was Saturday.如果今天是星期一，前天就是星期六。Y～evening/afternoon/morning they went to an Italian hotel.昨天晚上/下午/早晨他们去了一家意大利饭店。〖反〗tomorrow;

(2)近日，不久前;昔日(recent past;time not long past)[U，C]：dressed in～'s fashion 穿着过时的服装;all our～s 我们度过的日日夜夜;the dim～s of mankind 人类朦胧的往昔;Remember the hair styles of～? 还记得前不久流行的发型吗?

adv(1)昨天(on the day preceding today)：Where did you go～? 昨天你去哪了?〖反〗tomorrow;

(2)最近(in the recent past)：I was not born～.我不是最近才出生的。(不要认为我一无所知);～week 八天前：He has not seen his teacher since～week.八天以来，他没有见过他的教师。