half a year 和a half years.和half year哪个正确..为什么

问题描述:

half a year 和a half years.和half year哪个正确..为什么
还有1.one and a years 2.one and half year.3.one and half years.4one half and one year哪个对的..也说明一下.好乱哦~.
还有英语分数表达中间加不加连字符有什么区别

half a year是正确的
另外一年半应该是one and half years