The sign for "buy" looks like you are taking money from your
hand and placing it in someone else's hand.
BUY:
Sentence: Everyday you buy what?
Notes:
SHOPPING: To sign "shopping" do a repeated version of the sign
buy. Use a smaller movement but do it twice. Start the right hand from a
position behind and above the left hand. Then bring it forward and down so it
brushes along the left palm and continues forward out in front of the left
hand.