Question

sixteen-year-olds跟sixteen-year-old有什么区别

Answer 1

区别如下：
1）sixteen-year-olds只有一种词性。
名词。因为后面加了s。
同类用法只要改前面的数字。
例句
Eighteen-year-olds qualify to vote .
年满十八岁者有选举权。
Even five-year-olds do not want a party every day.
就算是5岁的孩子也不想天天聚会。

2）sixteen-year-old通常只做形容词用。
如
Sixteen-Year-old Hans stepped forward.
十六岁的汉斯向前地踏。
Mike is a sixteen-year-old boy.
迈克是一个16岁的男孩。