Does he have a coccer.中的Does he 后为什么要跟have不跟has

Does he have a beard?为什么have 不是has呢, does he have any apples? 为什么不能用has He has 2 sisters,but he does not have a brother 那个have为什么不用h --Does he have a bat?--Yes,he ____ has one. he has a headache Q:does he have a headache Q:What does he h does,have,headache,he,a,) Does he have a car? does he have small eyes?为什么不是 does he has small eyes? 为什么Does he have a tennis ball?这里用have? does后面跟的动词是什么形式?例如Why does he ________(have)to stay here? what（）he（）onfriday?A.do;have B.does;has C.does;have Does he have a book 能把have改成has吗?为什么?has能不能用在第三人称单数的提问句?