Here's why:
* Present Perfect: Indicates an action that started in the past and continues up to the present.
* Continuous: Indicates an ongoing action.
Let's break down the elements:
* Has: This is the present tense of the auxiliary verb "have".
* Been: This is the past participle of the verb "be" which helps form the continuous aspect.
* Working: This is the present participle of the verb "work".
Example:
"She has been working on that project all week."
This sentence indicates that she started working on the project sometime in the past and is still working on it now.