by mistake由于差错；
make mistakes 出错；
①by 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.
I used your ink by mistake.我用错了你的墨水。
②make a mistake 犯了一个错误，make mistakes 犯错……
例句：
He made some spelling mistakes in his test paper.在考试试卷中,他犯了拼写错误。
She made a mistake by taking the wrong textbook to class.她犯了个错,上课拿错了课本.
