Identify the sentence that correctly uses the present perfect continuous tense.
Answer and explanation
Correct answer: D. Ecologists have been studying the migratory patterns of arctic terns since 2015.
- Step 1: An action that started in the past and continues into the present with 'since' requires the present perfect continuous ('have been studying'). Step 2. 'Have been studying' connects the past starting point (2015) to ongoing present observation. Answer: Ecologists have been studying the migratory patterns of arctic terns since 2015. Why not the others: Present continuous ('are studying') or simple present ('study') cannot be combined with 'since + past point in time'.
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