雅思写作句型整理：如何表达时间

 　　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 spanning¹ 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

1 spanning   

n. 跨度, 拉线, [数]生成, 长成 动词span的现在分词形式

参考例句：

• We call such a spanning subgraph T an economical spanning subgraph. 我们称这样的生成子图T为廉价的生成子图。
• These were serious investigations, each spanning several months. 这些审查都很慎重，每一个审查项目都要用几个月的时间。