I have some problems with the present perfect continuous tense, as presented in Cambridge English Grammar in USE By Raymond Murphy.
We use the present perfect continuous for an activity that has recently stopped or just stopped. There is a connection with now.
What is the difference between the sense of the present perfect continuous and the simple present?
- You're out of breath. Have you been working? (you're out of breath now)
- Did you work? (simple present)
- Why are your clothes so dirty? What have you been doing?
- What did you do?
- I've been working hard. Now I'm going to have a break.
- I've worked now I'm going to have a break.