2、用法：A：常作定语，用于名词前,一般不单独使用。Eg: an eight- year-old boy\ a ten-metre-tall tree
B：复合形容词后加复数，表示一类人或物，可独立作主语。Holiday(C)
选择：1、He is_____and he has an_____sister. A.ten years old ,8 –year-old B.ten-year-old,ten years old
2、We will have a______holiday after the exam. A.two month B.two-month C.two -months
3、I think______can choose their own life style.
A .nineteen-year-old B. nineteen-year-olds C. nineteen years old D. nineteen-year olds
4、There is a ____tree in the park. A.four hundrde years B.four-hundred-year-old
C.four-hundred-year old
5、Nie Haisheng had a ______flight in space. A.five-days B.five-day C.five day’s
6、I’d like to spend________holiday in the country. A.a two-day B. two-day C. two days’
7、The little boy wrote a______letter to his uncle. A.five-hundred words B. five-hundred-word