PRESENT PERFECT CONTINUOUS
USE
Is used to say actions that have started in the past but continue in the present
ADVERBS EXPRESSIONS
FOR
Is used to express the duration of an activity we can say the amount of time
SINCE
Is used to express the specific moment in witch said action began
STRUCTURE GRAMATICAL
AFIRMATIVE
Subj + have / has + been + verb.ing + complement
Harry and Dumbledore have been talking for three hours
NEGATIVE
Subj + haven‘t/hasn’t + been + verb.ing + complement
Hermione hasn’t been studying Defence Against the Dark Arts for very long
INTERROGATIVE
Have / Has + subj + been + verbo. ing + ?
Have Voldemort and Potter been talking for a long time?