The Present Perfect Continuous
- If something started in the past and it still continuous and you really want to emphasize the length of time
Example: I have been studying English for five years (vijf jaar lang en nu nog steeds).
- if the activity annoys you :
Example: I have been waiting for your reply for over a week!
- with the keywords 'recently' en 'lately':
Example: Recently, I have been feeling sick.