Sure,you want to go upstairs?问：句中有个疑问句,为什么没用助动词do you...

Sure,you want to go upstairs?问：句中有个疑问句,为什么没用助动词do you... If you want to watch more,please go upstairs. Do you want to go What I want to say 为什么不要加助动词do阿,像what do you want to say 一样 为什么Do you want to go swimming this afternoon?不能说成Do you want what country do you want to go to?为什么末尾有to? where do you wan Do you want to go to beijing? Do you want to go the movies with me?为什么want后面加to go do you relly want to go Who do you want to go with? What do you want to go best Do you want to go（）?