我买茶。/Wǒ mǎi chá./ I BUY TEA.

我买茶。/Wǒ mǎi chá./ I BUY TEA.

我买了茶。/Wǒ mǎi le chá./ I (HAVE) BOUGHT TEA.

We use 了 to indicate that a particular action is finished.

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