de
1
of
2
~'s (possessive particle)
3
(used after an attribute)
4
(used to form a nominal expression)
5
(used at the end of a declarative sentence for emphasis)
这道菜真很好吃。
This dish is delicious.
你是最好
You are the best.
他是北京大学学生。
He is a student at Peking University (Beijing University).