 In this unit, we're going to be looking at modal auxiliary verbs. What are modal auxiliary verbs? Well, suppose you draw something such as this. It's quite clearly a chair, and we can make a simple sentence to convey that point. It's a chair. What if we were to use the simple class from a Pictionary game, where students have to guess what you're drawing? What about this? It could be a ball. It might be the sun. Let's draw a second circle. It might be a pair of glasses. It could be a stereo radio. If we were to continue, we would say it must be a bicycle. These words that I've boxed might, could and must are called modal auxiliary verbs. They express the speaker's feeling or attitude towards this particular verb, in this case, the verb to be, and they're very subjective.