的 de
the marker of noun modification,
eg 老师的书 lǎo shī de shū teacher’s book
地 de
the marker of pre-verbal modification of activity, verbs
eg 慢慢地走 màn màn de zǒu slowly walk
得 de
(1)the marker of post-verbal modification of activity verbs,
eg 跳得高 tiào de gāo jump highly
(2)the marker of extent modification of sative adjectival verbs
eg 他饿得走不动了。 Tā è de zǒu bú dòng le。
He is too hungry to go.