three year olds与three-year-old的区别

three year olds与three-year-old的区别

英语中，没有three year olds这个表达，正确书写格式是three-year-olds。


　　以下是three-year-olds和three-year-old的区别：
three-year-olds的词性为名词，为名词three-year-old的复数形式，意思是：三岁大的人。例如：
These are all three-year-olds. 这些都是三岁大的小孩。
three-year-old 可以是单数名词，意思是：三岁大的人。也可以是形容词，意思是：三岁大的。例如：
她是个三岁大的孩子。
She is a three-year-old. (three-year-old 为名词）
She is a three-year-old girl. （three-year-old 为形容词）

three-year-old 这是个合成形容词, 后面必须接名词, 作定语
如:
the three-year-old baby
比较:
The baby is three years old(作表语)