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 on wards / since then

　　13. by the year of …

　　after / before + 年/ 月