> I have studied English for 5 years.

> The company has been expanding for 3 years.

一、表示从过去持续到现在的动作

1. I have lived in New York for 8 years.

2. She has worked at the company for 15 years.

3. They have traveled to 5 countries.

二、强调过去动作对现在的影响

4. The project has been completed for 6 months.

5. The relationship has lasted for 2 years.

6. The problem has been solved for 3 days.

三、与时间点结合使用

7. Since 2010, I have been learning French.

8. For 5 years now, the company has been growing steadily.

9. Since the meeting started, we have discussed the plan for 2 hours.

四、与现在完成进行时结合（表示动作仍在进行）

10. I have been studying for the exam for 3 hours.

11. They have been preparing the report for the past 4 days.

12. The meeting has been going on for 1.5 hours.

注意事项：

当时间段明确表示从过去持续到现在且可能继续持续下去时，优先使用现在完成时。- 若需强调动作的持续性且未明确结束时间，可用现在完成进行时。- 时间段前可用时间状语如"for + 时间段"（如5 years）、"since + 时间点"（如since 2010）等辅助说明。