half的意思是:一半,二分之一。半个小时是:half an hour,
在表示“一个半”的意思时,是:one and a half+可以名词复数,或者:one+可数名词单数and a half,不是one and half.
例如:
1.一个半苹果:
one apple and a half或者one and a half apples.
2.一个半小时:
one hour and a half或者one and a half hours.
3.一天半:
one and a half days或者one day and a half.