（1）表示时间的介词及介词短语in, at, on, before，after，till，since，for, fromto, until， by，in the middle of，at the beginning of， at the end of，at half past five，at night，in a week，in the morning，in class，at sunrise， in spring/summer/autumn/winter，on Sunday，on Saturday afternoon，on a winter evening，for a long time，for two months，after school，since liberation，before lunch，at the time of，at the age of
