Nǐ hǎo
Hello
了
Particle (completed action or change of state)
她已经去学校了,所以我不等她了。
She has already gone to school, so I won't wait for her.
我吃了。
I have eaten.

[le-] Lennie the Lizard climbs onto a chair to hang a painting on the wall featuring the Chinese character 了. 🖼️ With a final stroke of the brush, Lennie declares, "Now everything is 了 complete!" He then steps back to admire how the room's state has changed.
"particle" in Chinese is 了 (le).
了 (le) means "Particle (completed action or change of state)".
It is pronounced le (written as le). The page has audio recorded by a native speaker.
It is written 了.
了 belongs to the HSK 1 vocabulary list.
Tomyo
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