1. She has been studying for two hours.
2. The boys have been making a noise for an hour.
3. I have been solving sums since morning.
4. The horse has been running very fast since 10 o'clock
5. We have been listening to the news for five minutes.

Negative Sentences:

1. She has not been studying for two hours.
2. The boys have not been making a noise for an hour.
3. I have not been solving sums since morning.
4. The horse has not been running very fast since 10 o' clock.
5. We have not been listening to the news for five minutes.

Interrogative Sentences

1. Have the boys been making a noise for an hour?
2. Have I been solving sums since morning?
3. Has the horse been running very fast since 10 o' clock?
4. Have we been listening to the news for five minutes?
5. Has she been studying for two hours?