主语是I/we/you/they等时用do,he/she 用does,has也一样,如果have做实意动词用,则用助动词do/does,have用原型,如have做助动词,则要看主语是I/we/you/they,用have,he/she用has我是在问改为一般疑问句时要不要把has改为have！你把那个句子写出来我看看She has a pen His mother often plays foot ball该一般疑问句Does she have a pen?Does his mother often play football？第一个就是我给你说的have子这里做实意动词，意为“有”，主语是she，单数第三人称，改为一般疑问句要用助动词does。 第二个主语his mother也是单数第三人称