Correct: I graduated from university two years ago (Simple Past), She had already left by the time I arrived (Past Perfect), They were playing video games all afternoon (Past Continuous), She had been waiting for 30 minutes (Past Perfect Continuous), Had they left the house when you arrived? (Interrogative Past Perfect), Incorrect: The kids were swimming in the pool when I arrived (Past Perfect), I had been working for two hours when the phone rang (Past Continuous), He wasn't sleeping during the meeting (Negative Past Perfect), Were they playing tennis when it started raining? (Interrogative Simple Past)), I was walking home when it started to rain (Simple Past),

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