That was not a mistake!
I made a mistake on my maths exam!
I made a mistake by missing the deadline for the project.
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.
"I made a big mistake", he said ruefully.
After realizing her mistake, she asked him for forgiveness.
The project succeeded despite their mistakes.
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.
The teacher made an unintentioned mistake.
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".