Completed actions with 了

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Completed is not the same as past tense

了 after a verb can present an action as completed: 买了两本书. It is an aspect marker, not a universal past-tense ending. A past-time expression can occur without 了 when the sentence has a different focus.

Start with a concrete completed action and a quantity: 我昨天买了两本书. 昨天 tells when; 了 presents the buying as a completed event.

Negate the event with 没有

Use 没有 or its shorter form 没 before the verb to say that an event did not happen. In this basic negative completed-event pattern, omit the completed-action 了.

Contrast 不喝, which can describe a habit or refusal, with 没喝, which says the drinking did not happen. Context matters, so include a time word when it helps.

Recognize a useful question as a whole

你吃饭了吗？ is a common question asking whether someone has eaten. Here 了 is at the end of the clause rather than directly after the verb. Sentence-final 了 has related uses that extend beyond completed events.

Learn this question as a complete chunk for now. Answer 吃了 or 没有 / 还没有. Avoid adding 了 to every sentence merely because the English translation is in the past.

Lesson vocabulary

Listen once, say it aloud, and try to recall the Chinese before looking.

Practice questions

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Independent practice

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