I am a 11-year-old girl.为什么girl后面不加s

I am a 11-year-old girl.为什么girl后面不加s ‘I am twelve year old.'怎么改错 I am eleven year old.（改错） I am fourteen yesrs old this year I am a 12-year-old sunny I do very well in my studies什么意思 I am a sixteen-year-old skateboarder.Three years ago I____完型答案 为什么year old是放在一起的,i am ten old this year I am 12 year old改疑问句和回答 2011 ,I am eighteen years old this year. I am ten year old.这句话错在那里? I am ten years old next year.哪错了? I am born ten year old.的问句是什么 I am eleven years old this year.怎么翻译? I am seven years old this year,so I _______ six last year. I am twenty year old.I am _______ a child.A.not longer B.no long C.not any longer D.no longer I am thirteen years old this year.(用two years ago代替this year) I am eleven years old ths year.的同义句__ __ __eleven this year. This year I am t_ years old and next year I am thirteen.横线里填什么?