The most difficult part of answering a “wh” questions is actually knowing the meaning of the “wh” word. For instance, you have to know that “who” is asking for a person, “where” is asking for a place, “what” is asking for a thing, “when” is referring to a time, and “why” is asking for a reason. “When” and “where” may still be too complicated for this age, but it’s always good to throw it in here and there.
When talking about “who” you can stick to basic things like looking through a photo album to label family members names or you can make it harder as in “Who drives a bus?”. Visual support is always welcome at this age and can be in the form of pictures, illustrations in books, videos, etc. And remind them that “who” is asking for a person.
As for “what”, it could be as simple as asking “What is this?” while using a flashcard, reading a book, etc. This usually only encourages a one-word response since it is not open-ended. You can make it slightly more complicated by saying “What do you see?”, “What do you need?”, etc. This allows for them to use a start phrase such as “I see a duck”. You can then go onto more difficult questions such as “What does a cow say?”, “What do you wear when it’s hot?”
When referring to “where” they have to know that you are asking about a place, so we find that when you’re walking down the street, driving, etc. it is helpful to talk about where you are going. You can even talk about the immediate here and now and ask “Where are you right now?” (e.g. – at home, in the car, in the stroller, etc.). It also gradually helps them understand concepts that are not tangible such as “Where is daddy?” (e.g. – work, on a business trip, etc.) – actual pictures of daddy at his workplace would also be great!