I would say that sometimes you would not 'identify' a mistake in your head. Also if you read it out loud you might realize how it does not make sense in your sentence.
Hope this helped!
;D
Young schoolteacher Charles Edward Chipping (Robert Donat) imposes strict discipline on his young charges at a Victorian-era English public school, becoming a fearsome presence on the campus grounds. But the love of spirited young suffragette Katherine Ellis (Greer Garson) brings the Latin instructor out of his shell and makes him a beloved campus institution into the 20th century and through the shattering violence of World War I. The film is based on the best-selling novel by James Hilton.
Answer:
Reading the notes you took while the teacher was talking.
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