has的原形单词是have。have英语单词，主要用作助动词、动词、名词，作助动词时意为已经，作动词时意为有、让、拿、从事、允许。

例句：The two groups of children have quite different characteristics.这两组儿童具有截然不同的特点。Now she won't have to go out to work any more.现在她不必再出去工作了。A new system has been devised to control traffic in the city.控制城市交通的新系统已经设计出来。