500
Identify the 3 tenses uses (narrative):
It was a cold night and it was raining. I was watching TV in the living room. Suddenly I heard a knock at the door. I got up and opened the door. But there was nobody there. The person who had knocked on the door had disappeared.
Past simple- heard, got up, opened.
Past continuous- was raining, was watching.
Past perfect- had knocked, had disappeared.