wǒ mǎi le niúròu.

I bought beef.

Breakdown of wǒ mǎi le niúròu.

• 我wǒ: I
• 了le: perfective particle
• 买mǎi: to buy

Questions & Answers about wǒ mǎi le niúròu.

Why is 了 (le) used in 我买了牛肉?

In this sentence, 了 marks that the action of buying was completed.

So 我买了牛肉 means something like:

• I bought beef
• I have bought beef

It does not exactly equal the English past tense, but in many simple sentences it often corresponds to a completed action in the past.

A helpful way to think about it is:

• 买 = buy / to buy
• 买了 = bought / did buy / have bought

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Why does 了 come after 买 instead of at the very end of the sentence?

Here, 了 is attached to the verb phrase to show that the action was completed:

• 我 买了 牛肉
• I bought beef

This is very common in Mandarin: verb + 了 + object.

Sentence-final 了 also exists, but it often adds a different nuance, such as a new situation or change of state.

Compare:

• 我买了牛肉。 = I bought beef.
• 我买牛肉了。 = I’m buying/bought beef now, or as for beef, I bought it; often more context-dependent.

For beginners, the safest pattern is:

• Subject + Verb + 了 + Object

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