I couldn’t resist. If it had been a notice about washing your hands, or turning off the lights, anything else really…. I would have left it unedited. But the subject made it too tempting to ignore. So I made the corrections:
Afterwards, I must say I felt guilty. Did I shame someone who’s already trying to work on their less than perfect English? Someone who may have poor English only because they never got the chance to study properly at school? Perhaps someone more sensitive than me took down the sign after I left? Ugh. I felt like a bad person.
Or maybe they appreciated it? The sign may have taught me a lesson too.