half的用法!

Question

half的用法!

Answer 1

half 意为“一半”,复数形式是halves.用法有以下几点,
1.half可直接修饰名词,这个名词既可以是复数,也可以是单数.例如：
Half the apples are bad.这些苹果中有一半是坏的.
Half the apple is bad.这个苹果一半是坏的.
2.half of后跟名词时,这个名词前应有the,this,my等限定词修饰,这时of也可省略.例如：
Half (of) the people are from England.这些人中有一半是英国人.
Half (of) the students in that school are from the countryside.那个学校有一半学生来自农村.
3.half of后也可接代词,这时of不能省略.例如：
Half of them enjoyed the party last night.他们中有一半人喜欢昨晚的晚会.
Only half of them came last Sunday.上星期天他们中只有一半人来了.
4.在谈论距离、长度和数量时,要用half,一般不用half of.例如：
His old house is half a mile down the road.他的旧居在沿着这条路往下走半英里的地方.
Mr Smith drank half a bottle of whisky last night.史密斯先生昨晚喝了半瓶威士忌酒.
5.half也可用作副词.例如：
I half agree with you.我不完全同意你的意见.
This meal is only half-cooked.这顿饭做得只有半熟.
注意：①“half + 名词”或“half of + 名词”作主语时,谓语动词的单、复数形式由所接名词的单、复数形式来决定,名词是中心词.例如：
Half (of) the oranges are bad.一半的桔子坏了.
Half (of) the car was damaged.那辆车有一半被损坏了.
②“……个半……”可表达为“数词 + 名词 + and a half”或“数词 + and a half + 名词（复数）”.例如：
三个半月 three months and a half / three and a half months