verb
1
BAD : As far as I concern, the cost of the repair is not my responsibility.
GOOD : As far as I'm concerned, the cost of the repair is not my responsibility.
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as far as sb/sth is concerned : 'As far as my parents are concerned, I'm free to come whenever I like.' 'As far as the law is concerned, you are innocent until proven guilty.' 'As far as your grammar is concerned, you seem to be having a problem with tenses.'
2
BAD : You should concern more about your health.
GOOD : You should be more concerned about your health.
BAD : There are far more serious things to concern about.
GOOD : There are far more serious things to be concerned about.
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be concerned about sth (= be worried or anxious): 'The government is becoming increasingly concerned about the rising level of unemployment.' 'The manager is naturally very concerned about the recent spate of injuries.'
3
BAD : The first chapter is concerned about the disposal of nuclear waste.
GOOD : The first chapter is concerned with the disposal of nuclear waste.
GOOD : The first chapter concerns the disposal of nuclear waste.
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be concerned with sth OR concern sth = (of a book, film, essay etc) be about a particular subject: 'The article is concerned with recent developments in primary education.'
4
BAD : Some dentists are more concerned in earning money than doing a good job.
GOOD : Some dentists are more concerned with earning money than doing a good job.
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be concerned with ( doing ) sth = be interested in: 'We should be more concerned with re-educating criminals than punishing them.'