The sign WHICH can be used to ask questions such as, "Do you want a red or green shirt?" You can see an example of the sign WHICH in the video above. He asks, "Is the chair under your desk or is it in the dining room?" and signs, "WHERECHAIR? CL:1(index left) DESKCL:1(index right) DINING ROOM WHICH?)whq" WHICH is normally signed last in questions such as these. When using WHICH to ask a wh-question, make sure use the wh-question facial expressions (eyebrows down).