Present Perfect Continuous - Hiện tại Hoàn thành Tiếp diễnFORM of Present Perfect Continuous
The Present Perfect Continuous has two parts: The Present Perfect of the verb 'to
be' (have/has been) and the Present Participle of the main verb (V-ing). See
examples below.
S + have/has + been + V-ing
I have been learning English.
He has been swimming well.
They have been watching TV.
S + have/has not+ been + V-ing
I haven't been learning English.
He hasn't been swimming well.
They have not been watching TV.
Have/Has + S + been + V-ing?
Have you been learning English?
Has he been swimming well?
Have they been watching TV?

The Present Perfect continuous refers to an unspecified time between 'before now'
and 'now'. The speaker is thinking about something that started but perhaps did not
finish in that period of time. He/she is interested in the process as well as the
result, and this process may still be going on, or may have just finished.

USEs of Present Perfect Continuous
1. to describe Actions that started in the past and continue in the present.
 They have been talking for the last hour. (= they are still talking now)
 She has been working at that company for three years. (= she is still
working for the company now and she will work more time in the future.)
 What have you been doing for the last 30 minutes?