I know him to have an unfriendly personality.
Is the above sentence grammatically correct?
It's perfectly fine, if a bit formal.
[Not a teahcer]
Thank you so much . Actually I came across "Ludwig Van Beethoven was known to have an unfriendly and demanding personality" and became wondered about its active form .^0^
P.S.: Then,,,,Can "The colonies of bees have also never been found to have moved to another location or hive" be changed to "We have also never found the colonies of bees to moved to another location or hive"?