在英语里半小时是说成half hour还是thirty minutes?

在英语里半小时是说成half hour还是thirty minutes? He will be here in half an hour.他将在这半小时后,还是半小时? 一个半小时 英语：是one and a half hour 还是 one and a half hours one half hour 到底是半小时还是1个半小时 半小时用英语讲为什么是half an hour而不是a half hour 请问“两个半小时”是“two and a half hour”还是“tow and a half hours”? thirty minutes_____ (be)half an hour Thirty m____ is half an hour 是half hour还是half an hour? a half hour还是half an hour? half an hour 是“一个半小时”还是“半个小时” 它们分别怎么表达 一个半小时英文怎么说到底是one and a half hour还是one and a half hours 哪个正确,