如果你认为你可以那样行事，那你就错了。

If you think you can behave like that, you are ___mistaken.

首先，你在文章中提到我们那天承诺了45个摊位，但你完全错了，因为我们只宣布了35个。

First of all, you mentioned in the article that we promised 45 stalls for that day, but you are completely ___mistaken as we announced only 35.

这个理论被证明是错误的，因为它建立在一个错误的前提上。

The theory was proven wrong because it was built on a ___mistaken premise.