twelve years old twelve year old twelve—years—old twelve—yea

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twelve years old twelve year old twelve—years—old twelve—year—old 有什么区别
twelve years old
twelve year old
twelve—years—old
twelve—year—old
有什么区别

我可以帮您解答
您第二个和第三个词组都是错的,我们不这样说的.只有第一个和最后一个正确.
twelve years old 是一般的词组,没有特性的规定,例：
1、I am twelve years old.
2、He must be twelve years oid.
而twelve-year-old则是一个形容词,用来修饰名词.例：
1、He is a twelve-year-old boy.
2、This is a twelve-year-old tree.

twelve years old twelve year old twelve—years—old twelve—yea twelve years old词性 Lily is twelve years old this year.(对画线部分提问）画线部分： twelve yea Tony is twelve ( )old.year years , l am twelve years old He is twelve years old. I am twelve years old. a twelve-year-old和 twelve years old有区别吗?如果有是什么区别 Tony is twelve years old.（对划线部分提问）划线部分twelve year old twelve-year-old与twelve years old的区别及用法 He is twelve years old 提问 Peter is twelve years old 同义句