的 (de) means “of; ~'s (possessive particle); (used after an attribute); (used to form a nominal expression); (used at the end of a declarative sentence for emphasis); also pr. [dì] or [di] in poetry and songs”. It is an HSK 1 Chinese character in the HSK 3.0 vocabulary.
这是我的书。
Zhè shì wǒ de shū.
This is my book.
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