Tell your students that they are stuck in a cave. Put them in groups of four. Give them different pictures or word cards with random items on them e.g. a chocolate bar, a chewing gum, a rope, a dog, a magazine, a plastic bag and so on. Each student has their own set of cards and each member of the group has different cards. Ask them to tell you how they would use these items in the cave. Would they also use them to get out of the cave? How? Each group should decide on the two or three most necessary items. They should use the 2nd conditional when saying how they will use this.
Item on picture card:
If I had a chewing gum, I would chew it in order to feel less stressed.