a two－year －old boy two－years－old two years old 这些类似的都怎么区分

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a two－year －old boy two－years－old two years old 这些类似的都怎么区分
要有实际例子和意思

a two－year －old boy 一个两岁的男孩.没有 two－years－old 这种用法；
two years old 两岁.如
He is a two -year-old boy.
The boy is two years old.
加油!不明白再问!
再问：那是不是有two－years boy或者two－years old boy这种用法
再答：没有，数词与名词组成的复合形容词，用‘-’ 连接，名词不能加S

a two－year －old boy two－years－old two years old 这些类似的都怎么区分 two - year - old two - years -old two year old two years old 为什么要说the/a two-year-old boy 不能说two years old boy two years old与two-year-old的用法区别 two-year-old 与two years old有何区别 two( )twins. A. nine-years-old B. nine-year-old C. nine year a three－year－old boy,可以说成a three years old The little dog () two years old this year. The little dog ____ two years old this year He died two years ago,l____his five-year old daughter china,old,is,years,sixty-two,now His fatheris is forty-two years old.