year old只能是 He is only one year old.即years old的单数形式。 years old就是一岁以上的了，例如She is three years old. year old 和 years old通常都作表语。 首先要声明绝对没有years-old的说法，因为加上连接符以后year必须用单数。 数字-year-old表示几岁，与前两个最大的区别就是它在句中只能充当定语。 例如：a three-year-old boy一个三岁大的小男孩。 但是不能说The boy is three-year-old.也就是说它不能充当表语， 而要说 The boy is three years old.
year old ,years old ,year-old区别，语法，
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