In the sentence "She has been reading for three hours," the verb phrase "has been reading" represents:
Finite main verb with auxiliaries
The verb phrase "has been reading" consists of the auxiliary verbs "has" and "been" combined with the main verb "reading" in its present participle form.
This structure expresses the present perfect continuous tense, showing an action that started in the past and is still continuing, agreeing in number and person with the subject "She."
Because the phrase agrees with the subject and shows tense, it is finite, not non-finite, and it contains no modal verb like can or must, ruling out a modal construction.
Therefore, "has been reading" is a finite main verb used with auxiliaries.
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