主语是第一第二人称(I,you)或者复数(we,they)时,用have
主语是第三人称(he,she,it)时,用has
He has a pen.
一般疑问句: Does he have a pen?
对划线提问（划的应该是a pen）: What does he have?
否定句： He does not have a pen.
注意主语是我(I)时的变化：
I have a pen
一般疑问句: Do you have a pen?
对划线提问（划的应该是a pen）: What do you have?
否定句：I don't have a pen.
要把原句中的I换成you