English Grammar
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Comma before becauseLife 2010. 11. 16. 10:31
'Because' normally introduces a dependent clause, and dependent clauses are normally restrictive, hence taking no comma. When sentences and their clauses get too long, however, a comma may be necessary for clarity. from http://www.englishforums.com/English/CommaBeforeBecause/lrcv/post.htm
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Comma usage after howeverLife 2010. 11. 16. 10:19
'However' as a conjunction will not take a comma after it, as in 'I will despise you however old I grow'; a sentence is usually more clear, however, with the adverbial 'however' offset with commas. from http://www.englishforums.com/English/CommaUsageAfterHowever/kvpw/post.htm