You've surely found the way English people speak a bit confusing, haven't you ? :) Welcome to a brush up exercise on short answers. This style of speaking is typical of natural English and it can be a bit mind boggling for learners.  Also it's a great way to revise  auxiliary verbs, which will help you formulate tag questions too. Take a listen and see if you can answer as quickly as Chris.  LEARNING TIP:  * Listen several times. * Write down the conversation, underline the auxiliary verb in the first sentence. * Write down your answer. * Listen again and answer quickly