The word his can only be maid a grammar mistake if spelled wrong or capitalized
"The grammar is off so you have to make a few grammar corrections," said Tom.
It means it (most likely/probably) is a grammar mistake. However, I do think that Microsoft Word (any version) has and can make mistakes with grammar and/or spelling.
Using proper grammar is one way to make sure others understand what you are trying to say. Some forms of grammar are different in foreign languages.
I guess it can be error? An error is the mistake, to make a mistake is to err.
The mistake is using the word "than" instead of "then". The sentence should read: Nancy brushed her teeth and then put on her makeup.
I am studying my grammar lessons right now.
Here: You made a mistake spelling the word "sentence."
Single mistake kills many. This is one of many examples for sentence use.
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.
Another word for mistake is error.
A three-letter word for making a mistake would be "err."Err is verb, and it means "be mistaken or incorrect; make a mistake."