Example 1: He was at the hospital because of the bruise. (no comma preceding because, since 'of the bruise' is a dependent clause-- No, it is just a prepositional phrase explaining why he was at the hospital ) Example 2: He was at the hospital because he suffered a bruise. (comma should precede because, since 'he suffered a bruise' is an independent clause-- No comma; it is a dependent clause ).
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