Verb + result — sticking outcomes onto actions
In English, 'I read' and 'I read it / I finished reading it' are different by adverbs and objects. Mandarin packs the outcome into a tiny morpheme stuck right on the verb: 看完 (read-finish = finish reading), 听懂 (listen-understand = hear and understand), 找到 (look-arrive = find by looking), 吃完 (eat-finish = finish eating). The second character is called a resultative complement — it tells you HOW the action ended. Without it, the action just happened; with it, the action achieved a specific outcome. The negation is a trap: you must use 没 (not 不), and the 了 disappears: 我没看完。 = I didn't finish reading.
The pattern: verb + result
verb + complement glues directly together with no space. The most common complements: 完 wán (finish — through to the end), 懂 dǒng (understand), 到 dào (reach / succeed at — find by looking, hear by listening), 见 jiàn (perceive — used with sense verbs), 好 hǎo (do successfully, ready, well). 吃完 = finish eating. 听懂 = hear and understand. 找到 = find. 看见 = see. 写好 = write properly / finish writing. The verb keeps its meaning; the complement adds the outcome. With 了 for completed action: 我吃完了。 = I'm done eating. 我找到了。 = I found it. 我听懂了。 = I got it / I understood.
完 vs. 好 vs. 到 — picking the right one
完 is for reaching the END of a finite quantity: 吃完饭 = finish the meal, 看完书 = read through to the end of the book, 写完作业 = finish the homework. 好 is for doing it WELL or to a usable standard: 写好 = write it properly, 做好 = get it done (right), 准备好 = get ready. 到 is for SUCCESS at a search-or-reach action: 找到 (find by searching), 看到 (see — actually catch sight of), 听到 (hear — register the sound), 买到 (manage to buy), 想到 (think of — the thought arrived). Sense verbs split: 看到/看见 both = see, 听到/听见 both = hear; the 见 versions are slightly more spoken.
懂 — understanding
懂 is the comprehension complement, paired with the input verbs: 听懂 (hear and understand), 看懂 (read/watch and understand). Crucially, English 'understand' is one word but Mandarin makes you pick the channel. 我听懂了你的话。 = I understood what you said. 我看懂了这本书。 = I understood the book. (Note: 明白 míngbai is also 'understand' but more conceptual — 'I get it / I see' — and works without a verb in front.) Negative: 我听不懂。 = I can't make out what you're saying. 我没听懂。 = I didn't catch what you said.
Negation — 没 + verb, NOT 不
Resultative compounds describe an outcome that DID or DID NOT occur — so they negate like past actions (lesson 11): 没 before the verb, no 了. 我吃完了。 → 我没吃完。 = I didn't finish eating. 我找到了。 → 我没找到。 = I didn't find it. 我听懂了。 → 我没听懂。 = I didn't catch it. 不 is wrong here: 我不吃完 would be either ungrammatical or interpreted oddly as 'I refuse to finish'. To say 'I'm not going to finish (a future refusal)', you'd recast: 我不想吃完 = I don't want to finish.
Potential: V得complement / V不complement
Mandarin has a tidy way to ask 'CAN this outcome happen?' — slot 得 de between the verb and the complement for 'can', 不 for 'can't'. 看得懂 = can understand (when reading), 看不懂 = can't understand. 听得见 / 听不见 = can/can't hear. 吃得完 / 吃不完 = can/can't finish eating. 你听得懂吗? = Can you understand? 这本书我看不懂。 = I can't make sense of this book. This is a different layer from past-tense 没看懂 (didn't catch it on this occasion); the potential form is about ABILITY in general — closer to 能 from lesson 13. Both forms are everywhere — you'll hear them constantly.
