biànhuà tài
Change-of-state aspect (变化态)
A sentence-final 了 signals that a situation has changed — something new has happened or a state has shifted from before. It is not past tense. It means 'things are different now.'
核心例句
外面下雪了，孩子们高兴了，学校放假了——一个"了"字，道出了所有新变化！
Wàimiàn xià xuě le, háizimen gāoxìng le, xuéxiào fàngjià le — yí ge "le" zì, dào chū le suǒyǒu xīn biànhuà!
It's snowing outside, the children are happy, school is on holiday — one little 了 captures every new change!
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2 个结构
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课程摘要
A sentence-final 了 signals that a situation has changed — something new has happened or a state has shifted from before. It is not past tense. It means 'things are different now.'
The change-of-state 了 (变化态) is placed at the end of a sentence or clause to indicate that a new situation has come about — something that was not true before is now true (or vice versa).
Common sentence patterns: 1. Subject + Adjective + 了: 我累了 (I am tired now — I wasn't before). 天黑了 (It got dark). 2. Subject + Verb + 了 (at sentence end): 他来了 (He's here now — he wasn't before). 下课了 (Class is over). 3. Subject + 是 + Noun + 了 (identity change): 她是妈妈了 (She is a mom now).
Key distinction — 变化态 了 vs completive 了 (动态了): - Completive 了 goes directly after the verb: 他买了两个面包 (He bought two pieces of bread — action completed). - Change-of-state 了 goes at the end of the sentence: 他来了 (He's here now — situation changed).
When NOT to use 变化态 了: do not add 了 to describe a permanent or timeless state. You would not say 太阳是热的了 to describe the sun — it has always been hot, no change occurred.
Negation: use 还没 + verb to say something has not yet changed: 她还没来 (She hasn't come yet — the situation has not changed).
语法句型
Subject + adjective + 了 (a quality has newly become true)
The subject has entered a new state — something that was not true before is now true.
我累了，想休息一下。
Wǒ lèi le, xiǎng xiūxi yīxià.
I'm tired now — I need a break.
天黑了，我们回家吧。
Tiān hēi le, wǒmen huí jiā ba.
It's dark now — let's go home.
她病了。
Tā bìng le.
She has gotten sick.
语法句型
Subject + verb + 了 (at sentence end — new situation)
An action has occurred, creating a new situation that did not exist before.
下课了，同学们都出去了。
Xià kè le, tóngxuémen dōu chūqu le.
Class is over — all the students went out.
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