PRESENT PERFECT PROGRESSIVE

Present Perfect Progressive is a tense which is used to express or state the ectivity or activities which was/were started from the certain time in the past and now it is/they are still progressing when it is/they are spoken.
The Patterns used to state those statement are:
+) Subject + have/has been+ V-ing + Object+ Adverb of time.
-) Subject + have/has been + V-ing + Object + Adverb of time.
?) Have/Has + subject + been + V-ing + Object + Adverb of time.
The adverbs of time used in this tense are:
up to now = sampai sekarang
until now = hingga kini
till now = sampai saat ini
since (followed by the point of time, diikuti tonggak waktu di waktu lampu, titik waktu sejak dimulainya) =sejak/semenjak
for (followed by the durantion or period of time the event is lasting or progressing untiuk now, diikuti durasi atau periode waktu berlangsungnya kegiatan itu sampai sekarang) = selama
Notes:
Subyek yang diikuti 'have; yaitu: They, We, I You (baca: Dewi ayu), dan kelompok suyek jamak, atau lebih dari satu, dengan ciri-ciri, ada kata-kata: Some (yang diikuti kata benda yg dpt dihitung/countable nouns), Many, few, a few, dsb. atau kata benda tertentu yg sudah mempunyai arti jamak seperti People = Orang-orang, Children, Oxen, men, women, dsb)
Sedangkan Subyek yang dikuti kata 'has' adalah He, She, It dan kelompok subyek tunggal, dg ciri-ciri ada kata-kata: One, An, A, some (yang diikuti uncountable nouns), Much, Any, dsb, atau semua kata benda yg tak dpt dihitung/Uncountable noun, sebelum kata benda subyek itu.
Examples:
1. They have been living in Indonesia for three years.
2. We have been waiting for our friends since 11 o'clock this moring.
3. I have been teaching English since I graduated from IEC in 1992.
4. You have been watching TV for hours so please switch off it now.
5. The doctor has been operating the patient since 10 o'clock in the morning and now it 11:15.
6. The patients have been sleeping on their beds until now.
7. The students have been studying since 07:00 this morning, and now the first period bell has already rung indicating 10:00.
8. The people have been waiting for the bus for long time but it has not arrived yet up to now.
9. The child has been crying for an hour, since he was left by his mother to the market.
10. Only a few students have been playing football on the field, some others have still been doing their test in the classroom waiting for the time over at 09:30.