13-year-old=13years如果是,区别在哪?Hewascutewhenheis（）.A.13yearsoldB.13yearoldC.13-year-oldD.13-years-old

Question

13-year-old=13 years 如果是,区别在哪?
He was cute when he is （ ）.
A.13years old B.13 year old
C.13-year-old D.13-years-old

Answer 1

当然是不等于咯,
13-year-old常作定语就是修饰名词的,即它后面要加名词才完整.
13 years old是一个名词词组,可以直接用.
如你的那道选择题,选A
注意：13-years-old这种词组是错误的.要记住有连字号的year不加s,没有连字号的（如果是可数名词的复数）要加s
试比较：原句可以这么说：He was cute when he is a 13-year-old boy (注意要加名词,如boy等,句子才完整）
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