Your students might have seen the Avengers Civil War movie. This worksheet includes several sentences which are needed to be transformed into conditionals. Ask your students to add whichever sentence they think will fit the conditional as in the example.
The sentence is: Scarlett Witch destroyed the building. The answer is: If Scarlet Witch is not careful she will destroy the building.
As you can see, we added some words so we could have a complete conditional. Have fun and ask your students to try to give the closest answers to the movie. You could even have a quick review of the movie before the exercise.