In this powerpoint there are some questions with the quetion words. There are also some exemples about some special sutiations that you might confused and also there are exemples about thier normal usage. For exemple you might get confused about the question; How old are you ? as the normal usage of How? is : How do you think about this t-shirt? So you can see that - How old are you? is a phrase that we use to ask someone about their age. You can't say -What's your age ? to ask someone's age.