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- Who is singing now?
- He works every day for four hours.
- He is working just now.
- I have been studying German for two years.
- He has been working since seven o'clock.
- I have been studying German for a long time.
- I have known him for many years.
- She will work for three hours.
- Put the cat out for the night! (du-form)
- The accused was released for three weeks. (simple past)
- I had to wait for several hours.
- I understand this problem for the first time.
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