1. How long have you been studying English?
I have been studying English for 7 years.
2. How long have have you been talking to your friends?
I have been talking to my friends for 20 minutes.
3. How long have you been working on your project?
I have been working on my project for 3 hours.
4. How long have you been watching this film?
I have been watching this film for 2 hours.
