From time to time You may use 'do' or 'does' to emphasize what you might be about to say. So, such as, in order to express that you want a T-shirt, you can accentuate the verb 'like' with 'do.' موسوعة الإمام جعفر بن محمد ( الصادق ) عليه السلام - https://dietrichg184npr3.wikicorrespondent.com/user