The usage of 的
Ｈｅｙ， ｈｅｌｌｏ ｅｖｅｒｙｏｎｅ ａｎｄ ｍｅｒｒｙ ｃｈｒｉｓｔｍａｓ ｔｏ ａｌｌ！！！ Ｉ ｗａｓ ｓｔｕｄｙｉｎｇ ｃｈｉｎｅｓｅ ｗｈｅｎ Ｉsaw these types of sentences:
I didn`t understand this usage, can anyone tell me when, how and why do I ｕｓｅ ｔｈｅ 的
JasonSchDecember 29, 2009, 08:03 AM
的 is used to describe noun. There are 3 patterns:
1 adj.+的+noun 聪明的人 cōngmíng de rén
2 noun.+的+noun. 你的票 nǐ de piào
Follows the third pattern and means: I work at a university of (in) Beijing.
Your other three sentences are more like statements and without proper context, they could be translated using more than one of the above patterns.
As for when, where and why to use 的 just keep studying, getting lots of input and practicing. Eventually, you'll start to get a feeling, in addition to any 'rule', about when, where and why to use it.