If you replace the "W" in the words "where", "what" and "when you get "there", "that" and "then", the answer to the question!
Magic Questions is a craft activity to help your students understand this. In includes 3 pages. Print all 3 pages (on card for best results) and cut around the lines. You need to cut out the white rectangles on page one as well. Staple page 1 to page 3 (along the sides) and slide page 2 into the middle.
The students can then move the middle section to change the question words (where, what and when) to the answer words (there, that and then). Magic!