As a challenge, teach grammar points in English.

作为一个挑战，用英语去教语法点。

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You can explain grammar points in Chinese as much as is necessary.

你可以根据需要，用汉语来解释语法点。

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You can explain grammar points in Chinese as much as is necessary.

你可以根据需要，用汉语来解释语法点。

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