Practice with por vs para! I use this PPT in class with whiteboards. I also use it with games/whiteboards. I show the slide and then count down and all students must raise their boards. I get immediate feedback on where the issues are as well as being able to give immediate and meaningful feedback to the student(s) who didn't have the correct answer. Sometimes I will use this as a review game with whiteboards or play the Family Feud with it. The things you can do are endless! There are 24 slides in all, with one of the slides asking for two answers.