1) Please let me know if you have any concerns regarding my schedule.
2) Please let me know if you have any concerns about my schedule.
3) Please let me know if you have any concerns of my schedule.
4) Please let me know if you have any concerns on my schedule.
Can anyone tell me which one (s) is/ are correct? I’m very confusing. Thanks for your help!
#1 and #2 are fine. #1 is much more formal.
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