**”She has used the bag for three years.”**
* This is the PRESENT PERFECT SIMPLE tense.
* The action started in the past and has just recently ended/completed.
* The pattern for this is “has + (past participle verb).”
* So, we can say that until recently, she used the bag for three years and will not use the bag anymore.
**”She has been using the bag for three years.”**
* This is the PRESENT PERFECT CONTINUOUS tense.
* The action started in the past and has continued until now and will continue in the future.
* The pattern for this is “has + (verb+ing).”
* So, we can say that for the past three years she has been using the bag and will continue to use it later.
Three examples:
1) “She **had** used the bag for three years” indicates she has since stopped using the bag. We don’t know which three years she used the bag, but she has stopped. **had** = past tense.
2) “She **has** used the bag for three years” does not indicate she has stopped using the bag. It implies she started using the bag three years ago and is still using it. **has** = present tense.
3) “She **has been using** the bag for three years” also does not indicate she has stopped using the bag. It also implies she started using the bag three years ago and is still using it.
2 and 3 mean the same.
Colloquially, they are often used interchangeably.
The technical difference is the verb tense and what that implies.
“She has used it” is the Present Perfect tense. The action happened in the past but is relevant to the present. It emphasizes a completed action.
“She has been using it” is the Present Perfect Continuous tense, where the action started in the past and has continued up until now. It emphasizes the ongoing action.
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