Апочему в этом случае употреблён some ? do you want some lemonade too?

Потому что some,здесь ставится как прилагательное 

Вэтом случае мы употребляем some потому что lenonade это не исчесляемый предмет. а вообще там вроде бы должно быть any, так как это вопрос.

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