in : 『～지나서, ～만에』     within : 『～이내에』

        ex 1) He will come home in a few days.

           2) He will come home within three days.

    before : 『～전에』       after : 『～후에』

        ex 1) You must come back before dark.

           2) He came back after a few hours.

     form : 『～부터』 (시간의 출발점)

     since : 『～이래로』 (과거부터 현재까지 계속)

        ex 1) He will live here from next month.

           2) He has lived here since last year.

      for : 『～동안』  (일정한 길이의 시간, 일반적으로 숫자 앞에서 쓰임)

      during : 『～중에』 (어떤 일이 계속되고 있는 특정한 기간)

       though : 『～동안 죽』 (처음부터 끝까지)

        ex 1) He has studied English for three hours.

           2) I went to my uncle's (house) during the summer vacation.

           3) It kept raining through the night.