half与half of的区别

half与half of的区别 a half 与half of 的区别? half the class 与half of the class的区别 half与half of, half a与a half的区别 a half与half a的区别 in half ,at half,by half的区别和用法 half dead与dying区别 half of+指代复数名词的which与half of them谓语单复数为何不同? half the ..half of the..有什么区别 half the sky half of the sky区别 half students和half of the students有什么区别