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I've always had difficulties in figuring out where commas should be placed. For example, in a phrase containing a conditional statement, how should I write...

  • If they don't arrive by noon, she'll be worried.
  • If they don't arrive by noon she'll be worried.
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So far as I understand it: if you are putting the conditional statement first, you should put the comma at the end of it. You don't need a comma if the conditional statement comes afterwards.

Treat the condition as the independent clause and the result as the dependent as Wikipedia describes.

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You are talking about a dependent (or subordinate) clause. Commas are required when starting a sentence with dependent clauses. See OWL Online Writing Lab. When the dependent clause is placed at the end of the sentence, a comma is not required. For example:

If I went to London, I would visit Big Ben.

I would visit Big Ben if I went to London.

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