<https://linguaholic.com/topic/1845-everyone-makes-mistakes/#comment-17856>
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"I've caught this in books, believe it or not. I was reading once, a book that was written in perfect English, and one sentence caught my eye: \"He didn't notice that his keys was not there\". The correct way to write that would've been \"He didn't notice that his keys weren't/were not there\". I'm surprised the editor didn't catch that mistake! Also, my mom finds typos/grammar mistakes in online news articles all the time. \n"
<https://linguaholic.com/topic/1845-everyone-makes-mistakes/#comment-17583>