2. We use: at for a PRECISE TIME in for MONTHS, YEARS, CENTURIES and LONG PERIODS on for DAYS and DATES

3. ATINON PRECISE TIME MONTHS, YEARS, CENTURIES and LONG PERIODS DAYS and DATES at 3 o'clockin Mayon Sunday at 10.30amin summeron Tuesdays at noonin the summeron 6 March at dinnertimein 1990on 25 Dec. 2010 at bedtimein the 1990son Christmas Day at sunrisein the next century on Independence Day at sunsetin the Ice Ageon my birthday at the momentin the past/futureon New Year's Eve

4. I have a meeting ______ 9am. The shop closes _____ midnight. Jane went home ______lunchtime. In England, it often snows______ December. Do you think we will go to Jupiter ______ the future? There should be a lot of progress_____ the next century. Do you work ____ Mondays? Her birthday is _____ 20 November. Where will you be _____ New Year's D

5. http://esl.about.com/library/quiz/blgrquiz_prep3.htm

6. Expression Example at night The stars shine at night. at the weekend I don't usually work at the weekend. at Christmas/Easter I stay with my family at Christmas. at the same time We finished the test at the same time. at presentHe's not home at present. Try later. :

7. inon in the morningon Tuesday morning in the morningson Saturday mornings in the afternoon(s)on Sunday afternoons in the evening(s)on Monday evening

8. I went to London last June. ( not in last June) He's coming back next Tuesday. ( not on next Tuesday) I go home every Easter. ( not at every Easter) We'll call you this evening. ( not in this evening)