That is a skill my little one is working on with her ABA therapists. They taught "What is it?" by hiding one of her preferred toys in their hands and saying, "I've got something in my hands!" in a really excited tone of voice. DD had to ask, "What is it?" before they would show it to her. To teach, "Where is it?" the therapists would distract her while she was doing an activity and take something she needed (like her crayon if she was coloring). To get it back, DD had to ask, "Where is my ___?"

i would say the question that I want her to ask, such as mine has sensory issues, so loud sounds would bother her, so I would jump in when I heard a sound that may bother her and as "what's that sound?" now she will ask that rather than throwing a tantrum.

Ha ha. I never thought about that one, I was so busy trying to get my son to answer questions (until I realized it probably inhibited his development).

For a serious answer, I would start with easy things first - what, where? - and make a game where I ask What is ?....then have the child take a turn asking. The same thing with where? Hide toys in a room. Look at the hiding spot (if needed). Where is ?

Why? How? Are higher on the developmental scale. First you demonstrate. Then encourage your child to practice those questions. It helps to always respond to any attempts to show curiosity and communication.