You are making a big mistake.

　　你正在犯一個(gè)嚴(yán)重的錯誤。

　　It's all been a ghastly mistake.

　　這是個(gè)極其惡劣的錯誤。

　　She paid dearly for her mistake.

　　她因犯錯誤而付出了巨大的代價(jià)。

　　The engagement was a bad mistake.

　　這婚約是一項(xiàng)大錯。

　　He was loath to admit his mistake.

　　他不愿承認(rèn)自己的錯誤。

　　I made a stupid mistake.

　　我犯了個(gè)愚蠢的錯誤。