这支钢笔

• Your pen is identical with mine
  你这支钢笔和我那支完全一样。
• This pen is ten yuan . it ' s too dear
  这支钢笔十元，太贵了。
• I bought the pen for 16
  我花了16元来买这支钢笔。
• He the pen for two years
  这支钢笔他买了两年了。
• This pen is not useful
  这支钢笔不好用。
• The pen that i am writing with is a birthday present given to me by my sister
  14我正在写字的这支钢笔是我姐姐送给我的生日礼物。
• I found this fountain pen in the street . mike claims it is his , but possession is nine points of the law
  我在马路上发现了这支钢笔，麦克说是他的，但钢笔在我手中，我最有权利声称钢笔是我的。