所有格

1、中文：你做完功课了吗?

(误)Have you done homework?

(正)Have you done your homework?(表示做功课用do one's homework.)

2、中文：那些是我们老师的一些书。

(误)Those are some books of our teacher.

(正)Those are some books of our teacher's.(应用双重所有格形式。)

3、中文：这是我弟弟约翰的书。

(误)This is my brother John book.

(正)This is my brother John's book.(John是brother的同位语，John的书用John's book.)

4、中文：警察抓住了他的胳膊。

(误)The policemen caught him by his arm.

(正)The policemen caught him by the arm.(抓住身上某个部位用the，不用代词的所有格。)

5、中文：一个十岁的孩子

(误)a ten years old child

(误)a child of ten year old

(误)a ten year old child

(误)a ten-years-old child

(正)a ten-year-old child