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Present perfect progressiveThe present perfect tense can also be used in the progressive form. This is used to refer to situations where the action is ongoing at the current time, when there is also reference to the length of time it has been ongoing. Examples Current situation: Researchers are investigating clean energy sources. Since becoming aware of global warming, researchers have been investigating clean energy sources to replace fossil fuels. Current situation: She is working on her PhD. She has been working on her PhD for the past 12 months. Sample sentences
Refer to the numbered sentences above to answer the following questions. You can choose more than one option.
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