Present Perfect Continuous

Present Perfect Continuous
S + have/has + been + V-ing

Chi viec da bat dau va keo dai o thoi diem hien tai = recently, lately/vua moi day
a. Already started and lasting till now
   _ He’s been working for this company for three months
   _ We’ve been working with each other since high school.
   _ She’s been learning English for 6 months.

b. Completed (+lasting) with lately/recently
   _ He’s been making some money recently
   _ He’s been going to this school lately.
   _ My cousin Tom has been working for this company recently.

Contrasts with present perfect simple
There may be little contrast when some state verbs are used.
   _ How long have you lived here?
   _ How long have you been living here?
Some verbs (especially sit, lie, wait and stay) prefer the continuous form.
There may be a contrast between completion and incompletion, especially if the number of items completed is mentioned.
Completed: emphasis on achievement
   _ I've ironed five shirts this morning.
Incomplete, or recently completed: emphasis on duration
   _ I've been ironing my shirts this morning.