mistakes是mistake的复数形式，而mistake是可数的。mistake既可以作名词也可作动词,作为名词意思为错误、过失、失策,作为动词时意思为误会、把…误认为。

mistake的用法

1.表示“错误”，通常为可数名词；表示犯错误，通常用动词make；另外注意与介词常用搭配。如：

You made a mistake about the time.你弄错了时间。

She made a mistake over the bill.她把账算错了。

Don’t make any mistake about me.不要误解我的意思。

用于by mistake,意为“错误地”“弄错地”。如：

The nurse gave me the wrong medicine by mistake.护士给我吃错了药。

I’m sorry, I opened one of your letters by mistake.对不起，我错拆了你的一封信。

2.用作动词，表示“把……误认为是……”，一般用介词for。如：

She mistook a rope for a snake.她把一条绳子误认为蛇。

I had mistaken friendship for love.我误把友情当成了爱情。

mistake相关短语

by mistake 错误地
例句：I took his schoolbag as mine by mistake.我误将他的书包当作我的拿走了.
mistake A for B 误将A当作B
例句：The students mistook me for their teacher.学生们把我误认为他们的老师了.
make a mistake 犯了个错误
例句：She made a mistake by taking the wrong textbook to class.她犯了个错,上课拿错了课本.