When we want to talk about the event which happened in the past, we use simple past like this: I wrote a letter to my friend in French. But when we want to talk about the time before simple past, we use past perfect for example: When I went to the class the students had eaten the cake. So past perfect is about an action which happened before another action in the past. Look at the structure: subject + had + past participle. When I went to my dad’s room he had left. When I arrive to the airport the flight ha
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