They didn't word it that--they put it in the present tense: home prices double every ten years.

他们不是这样写的...他们用的是现在时,房价每十年就会翻一番

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So can be changed slightly, depending on tense, past, present or future as well as whether or not you want to ask a question.

因此这个句型要根据不同的时态，如过去时、现在时和将来时，作出一点调整；另外也会根据是否是问句而略有不同。

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