Present Perfect Progressive
-How long
1-قياس الوقت
adverb التي تاتي مع Present Perfect Progressive
(..since+for+all day/week (etc
.I have been sitting at my desk since seven o'clock. I have been sitting her for tow hours
2-الاحداث وقعت Recently مؤخرا
.All of the student have been studying hard . final exams start next week
الطلاب ابتدأو الدراسة مؤخرا لان الامتحنات الابوع القادم ,لهذا استعملنا present perfect progressive