什么情况用has什么情况用have，第一、二、三人称是哪些？have

按照主语确定，主语是第三人称单数用has,主语是第一人称，第二人称，第三人称复数用have。He has received extensive corrective surgery to his skull. 他的头骨做过大面积的矫形手术。You have to pay your outstanding bill before joining the scheme. 在参与该项目之前必需结清余账。