I know. I understand.

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I don't know. I don't understand.

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I understand. I see.

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I don't understand.

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I understand. (after listening)

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I don't understand. (after listening)

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I understand. I see.

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I don't understand (after looking). I can't read it.

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Do you understand?

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I don't know how to write it.

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I don't know what this character means.

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I don't know how to say in Chinese.

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