mistake错误可数吗

　　We've made a dreadful mistake.

　　我们犯了一个很大的错误。

　　You are making a big mistake.

　　你正在犯一个严重的错误。

　　It's all been a ghastly mistake.

　　这是个极其恶劣的错误。

　　She paid dearly for her mistake.

　　她因犯错误而付出了巨大的代价。

　　The engagement was a bad mistake.

　　这婚约是一项大错。

　　He was loath to admit his mistake.

　　他不愿承认自己的错误。

　　I made a stupid mistake.

　　我犯了个愚蠢的错误。