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5 By the time I arrived JOHN HAD BEEN COOKING for 30 minutes. This was interesting question. An action that began before a time in the past and continued up until that time with no indication whether or not the action continued beyond that time. I don't know if he continued cooking. Maybe he cooked 30 minutes before you arrived and then 1 more hour after I arrived. You don't know. The cooking wasn't finished. Also question 4 by the time I arrived JOHN HAD FINISHED cooking. It's Past perfect--HAD+participle. Cooking is not part of the verb. It s an +ing gerund in this sentence, so it tricked almost me. It's the object of the verb \"finished,\" the same like \"finished my homework\")
