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HSK 2.0 Level 1+ HSK 3.0 Level 1+ 6 min read

了 for Change and Completion

Recognize two early uses of 了: completed actions and new situations.

Pattern

Verb + 了; sentence-final 了

Action 了 says something happened; final 了 says the situation changed.

我买了一本书。

When to use 了 for Change and Completion

了 after a verb often marks a bounded completed action. Sentence-final 了 points to a new state or change from before.

我明白了。

I understand now.

下雨了，我们不去。

It started raining, so we are not going.

她来了。

She came / she is here now.

我吃饭了。

I ate.

Common traps

  • 了 is not a simple past-tense marker.
  • Do not use 了 after 没 for a non-event.
  • A sentence can use both verb 了 and final 了 when the meaning calls for it.

Targeted drill

Practice this exact pattern before moving on.

我买 一本书

Missing grammar piece
Meanings
completion or change particle