句中有谓语动词的话就要用DO  DOES,作为助动词；句中宾语是形容词或名词的话就要is  are,作为系动词.当句子主语是第三人称时,助动词(do)就要用三单形式does,系动词(is,are)就要用is.另外,当句中主语是单数的话,系动词也要用is. 如Is  he  a  boy?he是三单,所以用is  Are  they  boys?they  是复数,所以用are  Does  he  eat  meat?eat是谓语动词,所以要用助动词do,因为he  是三单,所以用does  Do  they  eat  meat?eat是谓语动词,所以用助动词do,因为they  是复数,所以就不用does,仍旧用do
怎么区分是用Are来问还是do来问还是is或does