Exercise 1. Usage 1 of the perfect progressive -- explaining what has happened during a period of time.
1. I've been using this software since Christmas.
2. She's been painting this landscape since February.
3. Mr. and Mrs. Jones have been renting this house since 1988.
4. The lab assistant has been being occupied with this research project since last December.
5. He's been rebuilding this boat since the autumn.
6. She's been designing the ladies' garments since last year.
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