1. in + 月/ 年

2. between … and …

3. from … to …

4. over the period from … to …

5. in the year between … and …

6. in the 3 years spanning from 2001 through 2004

7. for the first 3 months

8. for/ during/ over the next / following 6 months

9. for/ during/ over / in a period of 4 months

10. for/ during/ over / in a 4- month period

11. over/ for / during the same period

12. from then on / from this time/ point onwards / since then

13. by the year of …

after / before + 年/ 月