I have been running marathons since I was 15 years old. - Eu tenho corrido maratonas desde os 15 anos de idade.
We use the present perfect continuous when an action or more started in the past but continues into the present or is still relevant. The present perfect continuous gives emphasis to continuity:
The present perfect continuous is not normally used with verbs like 'know', 'believe', 'understand', 'agree', etc. These verbs are called stative verbs.
Present perfect or present perfect continuous? The present perfect simple (I've done) focuses on the action or its completion. The present perfect continuous (I've been doing) focuses on the action's continuity:
In some cases, both can be used:
|Summary of the two main situations when we use the present perfect continuous and examples.||BBC Learning|
|4 tips on how to decide between present perfect and present perfect continuous||Anglo-Link|