1. How long has he been studying English? He has been studying English since 2002.
2. How long has she been designing websites? She has been designing websites for a long time.
3. How long have you been living in Russia? I've been living in Russia since I was born.
4. How long have they been friends? They've been friends for three years.
5. How long has he been working in a shop? He has been working in a shop since he left school.