Răspuns :
1. The students have been writing/solving the exercises since 2 o'clock.
2. My brother is sleeping right now. He's been sleeping for two hours.
3. The teacher is teaching the present perfect continuous right now. She's been teaching for 15 minutes.
4. My friends are talking. They have been talking for a long time.
5. His parents are eating at a restaurant right now. They have been eating since 8 o'clock.
2. My brother is sleeping right now. He's been sleeping for two hours.
3. The teacher is teaching the present perfect continuous right now. She's been teaching for 15 minutes.
4. My friends are talking. They have been talking for a long time.
5. His parents are eating at a restaurant right now. They have been eating since 8 o'clock.