'I know closely' is a valid sentence in written English.
You can use it to describe one's familiarity with a person, place, or thing. For example: "I know my cousin's family closely, since I used to visit them every summer when I was a kid."
Fortunately for us, no one we know closely so far is amongst the dead.
Take it to a local group you know closely, or a high school orchestra (depending on the difficulty of the work) and ask them to try it out.
See how much more you admire someone who you already know or are getting to know closely then a celebrity who is constantly traveling, working, and doesn't have much time to chit-chat.
Then again, I know how closely my behaviour tallies with that of my morning-after-story-telling girlfriends, and so I find myself more inclined to believe them than any survey.
"The I.O.C. members I know most closely were never so naïve to think that China would be Korea all over again," said John MacAloon, an Olympic historian at the University of Chicago.
Others, people we knew closely, tortured to death, shot, assassinated.
In addition, there were no known closely related proteins to compare with these HDAs to establish its classification as a Class II histone deacetylase [ 1].
In the mind of every economist I know, he is still closely associated with rational expectations and its later refinements.
I know people who work closely with Mr. Lagerfeld at Chanel have been asking for a return to more intimate show spaces, and I can't imagine he's adverse to the idea.
Oly has been a colleague for a number of years now, and I am looking forward to working with him more closely – I know that the paper you love is very safe in his hands.
