Activity:
| at | in | on | 
| PRECISE   TIME | MONTHS,   YEARS, SEASONS, CENTURIES and LONG PERIODS | DAYS   and DATES | 
| at   3 o'clock | in   May | on   Sunday | 
| at   10.30am | in   summer | on   Tuesdays | 
| at   noon | in   the summer | on   6 March | 
| at   dinnertime | in   1990 | on   25 Dec. 2010 | 
| at   bedtime | in   the 1990s | on   Christmas Day | 
| at   sunrise | in   the next century | on   Independence Day | 
| at   sunset | in   the Ice Age | on   my birthday | 
| at   the moment | in   the past/future | on   New Year's Eve | 
2. Do exercises on Practicing Grammar- English Page- prepositions
 
 
 
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