That was not a mistake!
I made a mistake on my maths exam!
She knew she made a big mistake.
The teacher made an unintentioned mistake.
I don't want to "mistake" your kindness for weakness. If you "mistake"my intention,you are making a mistake. You must have "mistaken" me for someone else.
The project succeeded despite their mistakes.
After realizing her mistake, she asked him for forgiveness.
"I made a big mistake", he said ruefully.
Single mistake kills many. This is one of many examples for sentence use.
You must not let one mistake define the rest of your life.
There is a mistake in your bill.
Example sentence - It would be a mistake to expect a stranger online to correctly answer the questions on my homework assignments.
The spelling mistake in that sentence is in the word "mistake".