为什么two-year-old的year不加S而two-hundred-words的word要加S

two years old与two-year-old的用法区别 为什么two-year-old的year不加S而two-hundred-words的word要加S two - year - old two - years -old two year old two years old 哪两个对》 表示年龄的英文如果说年龄.是 two hundred years old 还是 two hundred year old 呢.为什么. 为什么要说the/a two-year-old boy 不能说two years old boy 像two-year-old中year不可以用复数吗为什么two-thirds里就可以用复数?什么时候连词符号里的名词可以用复数 year old,year-old,years old,years-old的区别 为什么year old是放在一起的,i am ten old this year 为什么 a four-year-old boy中的year可以不加复数,而分数two-thirds中连字符后的third就必须有s? 数字 years/year old与 数字-year-old的区别 He died two years ago,l____his five-year old daughter 为什么不用过去式 one year or two one or two year 的意思 year-old与years old的区别 four-year-old为什么year不用复数形式 two( )twins. A. nine-years-old B. nine-year-old C. nine years old D. nine year old 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 The little dog () two years old this year.用be动词的适当形式填空. two three- year -old girl 的谓语动词用is还是are?