Do you really want a count? If not, then
Have you ever known someone...
Which sounds better?
How many of you have known someone that has attempted or completed suicide before?
or
How many of you have known someone that has attempted or taken their own life from suicide before?
3 answers
If you want it phrased better (and grammatically correctly) --
Have you ever known someone who has attempted or committed suicide?
1. Wordiness hinders your reader/listener from understanding what you are really asking. Aim for concise phrasing.
http://grammar.ccc.commnet.edu/grammar/concise.htm
2. "someone" is singular; "their" is plural -- see the problem?
http://grammar.ccc.commnet.edu/grammar/pronouns.htm
Have you ever known someone who has attempted or committed suicide?
1. Wordiness hinders your reader/listener from understanding what you are really asking. Aim for concise phrasing.
http://grammar.ccc.commnet.edu/grammar/concise.htm
2. "someone" is singular; "their" is plural -- see the problem?
http://grammar.ccc.commnet.edu/grammar/pronouns.htm
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