English Usage - because - English editing.

1.When because follows a negative construction the meaning can be ambiguous. In the sentence he did not go because he was ill, for example, it is not clear whether it means ‘the reason he did not go was that he was ill’ or ‘being ill was not the reason for him going; there was another reason’. Some usage guides recommend using a comma for the first interpretation (he did not go, because he was ill) and no comma for the second interpretation, but it is probably wiser to avoid using because after a negative altogether; one way would be to turn the sentence around: because he was ill, he didn’t go.
2.As with other conjunctions such as but and and, it is still widely held that it is incorrect to begin a sentence with because. It has, however, long been used in this way in both written and spoken English (typically for rhetorical effect), and is quite acceptable.
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