HSK 2 grammar · particle
了
Sentence-final 了 — change of state
Pattern
+ +
( ) can be left out · other words may come before, between and after
How it works
了 at the end of a sentence marks a change — something is now different from before. It reports a new situation rather than a finished action.
Examples
下雨了。
Xià yǔ le.
It's raining now.
我饿了。
Wǒ è le.
I'm hungry now.
Related

See it in a story
In the app, 了 is underlined wherever it appears in the stories you read, and practised with sentences from them. Free.