half 和 half a month有什么区别？

half 和 half a month有什么区别？ one month and a half和one and a half month有区别吗?还有one hour and a half和one and half an hour哪个对? every half month与every half a month 哪个对 英语翻译必须有“my parents,be,london,half a month” half an hour 和a half hour有什么区别? ----- were you there ?---Half a month.谢谢!``~ two and a half month(s),month后加不加s? two and a half month(s),month后加不加swhy a half of month还是half a month再帮我拓展一下知识 half hour =half an hour half hour half an hour 的意思有和区别? He has been there for__A two and a half month B two and a half months C two and the half months D two and half a month 注意是：one and half 和 one and a half区别注意是：one and half 和 one and a half．他们有什么区别吗? 有one and half a month这种说法吗?一个半小时有多少种说法? month and a halfThe Antarctica explorers stayed on that ice-covered continent for____.A.a month and a half B.one and a half month c.a half and a month d.a half and one month 说明下理由 One and a half an hour 和An hour and a half 有什么不同 half a million和a half million 有什么不同他们都是指50万吗? 有half a month 这个说法吗?是不是半个月的意思 three months and half 和three and a half months 有什么区别?