Have you ever played the memory game where each person has to finish the sentenece, I want on vacation and I brought________?
Simple past
Teacher models: I went on vacation and I packed a swimming suit.  What did you pack? 
Each student responds as the question goes around the room.
 
Past progressive
Teacher: How was your vacation? I was very active. I was swimming, dancing, and learning to
dive. How about you?
Student1: I was enjoying many activities. I was horseback
riding and I was hiking in the woods.
Student2: I was also enjoying many things. I was exercising
and I was exploring.
Each student  tells
what he was doing.
 
Past perfect
By the time your vacation was over, what had you
accomplished?
Student 1: I had learned to fish.
Student 2: I had gone on nature walks.   
Each student responds.