Which one of these sentences is correct?

1 By using this method, they found that sugar is important in diet.
2 By using this method they found that sugar is important in diet.

Do we need a comma to separate two sentences?

  • 1
    Please, write a full sentence. Your example is a sentence fragment.
    – Mari-Lou A
    Commented Apr 25, 2015 at 10:44
  • 2
    More important than the comma here is the phrase "so impotent". If you mean "important" you should change "so" to "very". But if you do indeed mean "impotent", then eliminate "so".
    – TimR
    Commented Apr 25, 2015 at 11:36

1 Answer 1


CMOS (The Chicago Manual of Style) leaves the choice on whether to follow introductory adverbial clauses with commas with you:-)

It recommends though - but not very forcefully - skipping the comma for short ones.

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