Present perfect continuous
An action that started in the past and is still going on now.
English, never translated
I've been working here since 2019.
Explanation
Use the present perfect continuous when an action started in the past and is still true now. It ties the past to the present, which is exactly why a simple past will not do the job: "I worked here since 2019" tells an English speaker you have already left.
She's been studying all night.
They've been waiting for over an hour.
How long have you been learning English?
Many languages use a plain present tense for this idea, and translating it directly is the most common B1 mistake. If the action is still happening and you can say how long, English wants have/has been + -ing.