three years old 与 three-year-old 的区别

Question

如题所述

Answer 1

前者是 三岁大，
后者是 三岁大的，后面需要跟一个名词，才完整
He is three years old.他三岁大
He has a three-year-old son.他有一个三岁大的儿子。
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Answer 2

后者作定语
前者做表语
举例：
The little girl is three years old. 这个小女孩三岁了。 表语
three-year-old girl三岁大的小女孩 定语

Answer 3

three-year-old为形容词,比如:
my three-year-old sister
three years old为单词组合,比如
my sister is three years old.本回答被提问者采纳

Answer 4

无区别 同义短语