This topic was discussed in Holly's free class in Google Hangouts on November 19, 2016
Present perfect would describe through phrasal verb “look back”
Present perfect continuous has the same idea, more precisely it means “look back from now”
present perfect = emphasize continuing action/event
present perfect continuous = emphasize duration/length of time
present perfect continuous = emphasizes recent time or now
I have been seeing that movie before. = not correct
I have seen that movie before. = correct
Present perfect continuous = give a reason for why something is true now.
I'm late because I have been trying to eat breakfast very quickly.
This class was recorded and published on Youtube here: