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

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 two - year - old two - years -old two year old two years old 哪两个对》 two years old与two-year-old的用法区别 two( )twins. A. nine-years-old B. nine-year-old C. nine years old D. nine year old He died two years ago,l____his five-year old daughter The little dog ____ two years old this year I have two brothers . they are 13 ( ) this yearA years old B year oldC years' old D year's old I am thirteen years old this year.(用two years ago代替this year) 为什么要说the/a two-year-old boy 不能说two years old boy 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? 英语中前年怎么表示?Two year ago?The year before last year? year old,year-old,years old,years-old的区别 her five-year-old 10 year old age 为什么two-year-old的year不加S而two-hundred-words的word要加S two editions a year sixteen year olds 还是sixteen year old? Jim's little sister is only two ___ .A.year old B.old year C.years old D.old years 选择并语法说明