PREPOSITION 1 GIỚI TỪ CHỈ THỜI GIAN, NƠI CHỐN 1 AT Thời gian at 4 o’clock, at 5p m, at 1a m at night, at Christmas, at Easter, at once at last at the moment (), at present at weekends Nơi chốn at home, at the theatre, at the seaside, at the grocers, at the hairdressers, at the doctors, at school at the corner of the street, at the top, at the bottom, at the foot of the page, at the beginning, at the end (of the lesson, ),, at the shop, (To arrive) at the airport, railway station, 2 IN Thời.