I think these are some examples:
1. speaker phone is not made for public use.
2. don't be late for anything
3.cover your mouth coughing and sneezing.
4. use thank you/ sorry/ excuse(required)
5. Don't make a fun someone's laugh
You're right,The above things are unwritten but should follow rules in our society. Thanks for sharing wondergirl.
You're not going to master the rest of your life in one day. Don't stress. Master the day. Make this a daily reminder.
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