的 (de), 得 (de), 地 (de) - same sound, three different characters and three different jobs. Even native speakers mix them up in fast typing; learners just need the rule.
的 - the linker
的 attaches a modifier to a noun: possession (我的书 - my book), description (红的花 - red flowers), or a whole clause (我昨天买的那本书 - the book I bought yesterday). If you can drop the modifier into "___ [noun]", it is 的.
地 - the adverbial marker
地 turns a descriptor into an adverb before a verb: 他慢慢地走 (he walks slowly), 高兴地说 (said happily). It is the "-ly" of Chinese - mostly written register; speech often drops it entirely (他慢慢走）.
得 - the complement marker
得 after a verb introduces how well or how much: 他说得很好 (he speaks well), 我跑得很快 (I run fast), 累得不想动 (so tired I do not want to move). Verb + 得 + evaluation - remember it as "results, backwards".
The memory hook
| 的 | modifier + noun | 我的老师 / 漂亮的衣服 |
| 地 | adverb + verb | 认真地学习 |
| 得 | verb + degree | 写得很好 / 忙得不行 |
In speech all three are one sound and rarely distinguished aloud - the distinction lives in writing. Subtitles, essays and formal text keep them separate; texting often does not bother.
Common questions
What is the difference between 的, 得 and 地?
的 links modifiers to nouns (我的书), 地 links adverbs to verbs (慢慢地走), 得 links verbs to result/degree complements (说得很好).
Do native speakers mix up 的得地?
Constantly in informal typing - it is a famous pedantry topic online. Formal writing keeps them distinct, and learners are held to the distinction.
Is 得 always pronounced de?
No - it is a polyphone: dé (得到, obtain), de (particle), děi (得走了, must). The particle use is the neutral-tone de.