When do we use this tense?
Present Perfect Continuous tense is used when we want to emphazie the duration of an action that has happened in the past and:
"Have you been feeling alright?" ---> You feel that person seems sick or unhealthy
"Have you been smoking?" ---> You smell the smoke on that person.
NOTE: Using this tense in a question shows you can see, smell, hear or feel the results of that action. It is possible to insult someone by using this tense incorrectly.
*Present Perfect Continuous is productive when you learn some of sentences as fixed phrases, it helps make different sentence.
Signal words: for, since, all day, the whole week, how long?
Limited number of verbs using with Present Perfect Continuous: work, waiting, living, studying, doing, getting, taking (progress/ enquiries/ plans), thinking, trying, expecting.