... 199 9, in the winter, in the 20th century in an hour, in a minute, in a week, in a moment in the beginning, in the end, in a day ON: on August 8th, on Tuesday, on weekdays, on Christmas day ... should / could Used to / ought to Used to / ought to Today That day Yesterday The day before/ the previous day Tomorrow The next day/ the following day Now Then, at once Ago Before Last week The previous ... Ex1: My teacher is going to Ha Noi next Sunday You met her yesterday morning My teacher, whom you met yesterday morning, is going to Ha Noi next Sunday Non-restrictive clause Ex2: Ba is a student...