Differentiate between tenses: He was running vs. He has been running.
A. He was running indicates a completed action; He has been running indicates a past action.
B. He was running indicates a present action; He has been running indicates a future ongoing action.
C. He was running indicates a future action; He has been running indicates a completed action.
D. He was running indicates a past ongoing action; He has been running indicates an action that started in the past and continues to the present.

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Contractions and ConjunctionsCausative VerbA/AnVerb + InfinitiveAdverb Clauses of Timeand, so, but, becauseSimple and Past TensesArticles & PrepositionGrammar - QuantiflierSubordination ConjunctionsOther quiz:
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After lunch, Alan took a short walk before returning to —– office.
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