mistake是可数名词。mistake，作名词时意为“错误；误会；过失”；作动词时意为“弄错；误解”。

mistake是可数名词

1.I found a mistake in that sentence.

我发现那个句子有一个错误。

2.You've made several grammatical mistakes in the composition.

你的作文中犯了几处语法错误。

3.They made the big mistake of thinking they could seize its border with a relatively small force.

他们大错特错，居然认为以较少的兵力就能够夺取其边境地区。

mistake基本含义

n.(言语或行为上的) 错误，失误;(用词或数字等上的) 错误，口误，笔误;

v.误会;误解;看错;

第三人称单数：mistakes

复数：mistakes

现在分词：mistaking

过去式：mistook

过去分词：mistaken