half an hour 与 one half hour区别

half an hour 与 one half hour区别 half an hour 和a half hour有什么区别? 是half hour还是half an hour? half an hour or a half hour? a half hour还是half an hour? half hour =half an hour half an hour later half an hour? one hour and a half 与 an hour and a half的区别,还有后面的谓语动词到底该用单还是 One and a half an hour 和An hour and a half 有什么不同 one and a half hours 和 an hour and a half 就是说 超过一个小时候 hour one and a half hour看做单数还是复数?half an hour