Cats or dogs? Chocolate or ice cream? Making comparisons can ignite some interesting debates with the simplest of prompts.
Most of my posts include some sort of first language ressource to use as a launch pad or a vocabulary building tool. However, sometimes I like to see what words live spontaneously in the minds of my students.
Some of my more extraverted learners enjoy this because they do not have to struggle with the dual task of incorporating new words while stringing together meaning. Others find it utterly daunting because they have nothing to inspire their thoughts. Or the idea of just talking makes everything jam up inside.
In both cases, open ended questions can be either a good relief or a good challenge (that you can scaffold with various prompts if necessary).
Here is a good ressources to practice comparatives. The site features a ton questions organized in different themes and focuses, but I like this one because it contains a lot of variety and a relatively easy grammar element.